Q&A - PSLE Math
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ginginboy:
Hi,
I need help to solve the following P6 qns for my P6 boy. Appreciate your help anybody who can help in solving them. Thank you very much...
Qns 1:
Boy B had some 20-cent and 50-cent coins. The number of 20-cent coins was 3/7 of the number of 50-cent coins. If he saved another thirty coins of each type, the number of 20-cent coins would become 9/11 of the number of 50-cents coins.
What is the total value of the 20-cent coins that Boy B had at first?
20 cent ----50 cent ...(diff)
3u --------- 7u--------4u
+30-------+30 (since we add the same no. of coins, diff remain unchanged)
9-----------11--------2
X2--------x2--------x2
18u---------22u
15u-->30
1u-->2
No. Of 20 cent coins at first -->3x2=6, thus total value will be 6x0.2=$1.20
Qns 2:
Rachel made chocolate, mint and sugar doughnuts for sale. She made 80 more chocolate doughnuts than mint doughnuts. The number of mint doughnuts made was 24 more than the number of sugar doughnuts. She sold 3/4 of the chocolate doughnuts, 1/3 of the mint doughnuts and 1/2 of the sugar doughnuts. In the end, there were 416 doughnuts left. How many mint doughnuts did Rachel made? -
ginginboy:
Hi,
I need help to solve the following P6 qns for my P6 boy. Appreciate your help anybody who can help in solving them. Thank you very much...
Qns 1:
Boy B had some 20-cent and 50-cent coins. The number of 20-cent coins was 3/7 of the number of 50-cent coins. If he saved another thirty coins of each type, the number of 20-cent coins would become 9/11 of the number of 50-cents coins.
What is the total value of the 20-cent coins that Boy B had at first?
20 cent ----50 cent ...(diff)
3u --------- 7u--------4u
+30-------+30 (since we add the same no. of coins, diff remain unchanged)
9-----------11--------2
X2--------x2--------x2
18u---------22u
15u-->30
1u-->2
No. Of 20 cent coins at first -->3x2=6, thus total value will be 6x0.2=$1.20
Qns 2:
Rachel made chocolate, mint and sugar doughnuts for sale. She made 80 more chocolate doughnuts than mint doughnuts. The number of mint doughnuts made was 24 more than the number of sugar doughnuts. She sold 3/4 of the chocolate doughnuts, 1/3 of the mint doughnuts and 1/2 of the sugar doughnuts. In the end, there were 416 doughnuts left. How many mint doughnuts did Rachel made? -
Suz855:
Thanks Suz855,6a[boya][galsa]
6b[galsb][boyb]
6c[2unit][galsc]
Total boys -->5u
BoyC-->2u
BoyA+boyB-->5u-2u=3u
GalA+galB-->3u
Total pupils -->9u
Fraction of pupils that are boys --> 5/9
Cheers
how do you get total 9u for the boys? -
happyheart:
Total number of units for p6a n p6b is 6units since inferred that each class must have 3u of pupils, given the 3 classes have equal number thus 3x3u = 9 u.... Cheers
Thanks Suz855,Suz855:
6a[boya][galsa]
6b[galsb][boyb]
6c[2unit][galsc]
Total boys -->5u
BoyC-->2u
BoyA+boyB-->5u-2u=3u
GalA+galB-->3u
Total pupils -->9u
Fraction of pupils that are boys --> 5/9
Cheers
how do you get total 9u for the boys? -
Suz855:
Thanks Suz855,happyheart:
[quote=\"Suz855\"]6a[boya][galsa]
6b[galsb][boyb]
6c[2unit][galsc]
Total boys -->5u
BoyC-->2u
BoyA+boyB-->5u-2u=3u
GalA+galB-->3u
Total pupils -->9u
Fraction of pupils that are boys --> 5/9
Cheers
how do you get total 9u for the boys?
Total number of units for p6a n p6b is 6units since inferred that each class must have 3u of pupils, given the 3 classes have equal number thus 3x3u = 9 u.... Cheers[/quote]
I get it now, thank you. -
Please help to solve this questions…
1)Indriani had a bag of assorted candies.1/3 of the candies were lollipops and the rest were candy canes.She shared the lollipops equally among the boys such that each boy received 1/9 of the assorted candies.She then shared the candy canes equally among the girls such that each girl received 1/6 of the assorted candies.Find the number of boys and the number of girls.
2)Adam and Rahman shared some beads.If Adam gave 1/3 of his share to Rahmad,Rahmad would have 70 more than Adam.If Adam gave 1/5 of his share to Rahmad,Rahmad would have 10 more than Adam.How many beads does Adam have at first?
3)During the school holidays,Chris read 312 pages of a book at first.He read the remaining pages in 20 days,with the same number of pages each day.During these 20 days,he read 1/12 of the book in 6 days.How many pages of the book did he read in the 6 days? -
Please help to solve this questions…
1)Indriani had a bag of assorted candies.1/3 of the candies were lollipops and the rest were candy canes.She shared the lollipops equally among the boys such that each boy received 1/9 of the assorted candies.She then shared the candy canes equally among the girls such that each girl received 1/6 of the assorted candies.Find the number of boys and the number of girls.
2)Adam and Rahman shared some beads.If Adam gave 1/3 of his share to Rahmad,Rahmad would have 70 more than Adam.If Adam gave 1/5 of his share to Rahmad,Rahmad would have 10 more than Adam.How many beads does Adam have at first?
3)During the school holidays,Chris read 312 pages of a book at first.He read the remaining pages in 20 days,with the same number of pages each day.During these 20 days,he read 1/12 of the book in 6 days.How many pages of the book did he read in the 6 days? -
Mary Joy:
Number of boys = 1/3 ÷ 1/9 = 3Please help to solve this questions...
1)Indriani had a bag of assorted candies.1/3 of the candies were lollipops and the rest were candy canes.She shared the lollipops equally among the boys such that each boy received 1/9 of the assorted candies.She then shared the candy canes equally among the girls such that each girl received 1/6 of the assorted candies.Find the number of boys and the number of girls.
Number of girls = 2/3 ÷ 1/6 = 4
cheers. -
Mary Joy:
same as this question -Please help to solve this questions...
2)Adam and Rahman shared some beads.If Adam gave 1/3 of his share to Rahmad,Rahmad would have 70 more than Adam.If Adam gave 1/5 of his share to Rahmad,Rahmad would have 10 more than Adam.How many beads does Adam have at first?
\"If David after giving 1/3 of his money to Ken, Ken will have $70 more than David.
If David after giving 1/5 of his money to Ken, Ken will have $10 money than David. How much does David have initially?\"
- http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&start=8620
cheers. -
Mary Joy:
1/12 = 6/72Please help to solve this questions...
3)During the school holidays,Chris read 312 pages of a book at first.He read the remaining pages in 20 days,with the same number of pages each day.During these 20 days,he read 1/12 of the book in 6 days.How many pages of the book did he read in the 6 days?
6 days --> 6/72 book
1 day --> 1/72 book
20 days --> 20/72 book
1-20/72 = 52/72
52/72 book --> 312 pages
1/72 book --> 6 pages
6 days --> 6/72 book --> 36 pages
cheers.
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