Q&A - P4 Math
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tracywham:
HiHi, need help on this:
At a durian plantation, there were a number of durians on sale. For every 16 durians bought, 2 durians were given a way free. Mr Yusoff received a total of 96 durians free while Mr Hong received 112 durians free. If there were 45 durians left, how many durians were on sale?
(is there a faster way to solve this instead of drawing tables?)
Good Morning.
A very “Happy Mother’s Day”
You may use the “Grouping Concept”
Mr Yusoff and Mr Hong received (96 +112) or 208 durians free.
For a group of 16 durians bought, 2 durians were given away free.
208/2 ----- 104
104*16 ----- 1664
Number of durians on sale ------ 1664 + 208 + 45 ------ 1917
Best wishes -
Hi All,
Siti had 6 times as many apples as David at first. After Siti had given 450 apples to David, they had an equal number of apples.
(a) Find the number of apples David had at first.
(b) David gave away some apples and had half the number of apples Siti had. How many apples did David give away. -
Mary went shopping with some money.
In shop A, Mary spemt 2/3 of her monry on a blouse. At the bookstore, Mary spent 1/4 of her remaining money on a book. Finally, she spent all her monry to buy 2 CDs at $15 each How much did she have at first. -
Siti, Rahmesh & Peter had 528 stickers at first. Siti bought another 32 stickers, Ramesh gave 1/5 of his stickers away & Peter was given as many stickers as he had at first by his father. In the end, all three of them had equal number of stickers. Find the number of stickers Siti had at first.
-
titank:
At firstHi All,
Siti had 6 times as many apples as David at first. After Siti had given 450 apples to David, they had an equal number of apples.
(a) Find the number of apples David had at first.
(b) David gave away some apples and had half the number of apples Siti had. How many apples did David give away.
D=2u
S=12u
In the end
D=7u....receive 5u from Siti
S=7u....give 5u to David
5u=450
u=90
At first D have 2u = 2 x 90 = 180
B)from above both have 7u = 7 x 90 = 630
D gave away half 315 -
titank:
work backwardMary went shopping with some money.
In shop A, Mary spemt 2/3 of her monry on a blouse. At the bookstore, Mary spent 1/4 of her remaining money on a book. Finally, she spent all her monry to buy 2 CDs at $15 each How much did she have at first.
have $30 after spending 1/4 of her remaining money on book.
remaining money = 4u
spend 1u on book
left 3u = 30
u = 10
remaining money = 4u = 4 x 10 = 40
have 40 after spending 2/3 on blouse
at first have 3p
spend 2p on blouse
left p = 40
at first have 3p = 3 x 40 = 120 -
titank:
Siti, Rahmesh & Peter had 528 stickers at first. Siti bought another 32 stickers, Ramesh gave 1/5 of his stickers away & Peter was given as many stickers as he had at first by his father. In the end, all three of them had equal number of stickers. Find the number of stickers Siti had at first.
in the end each have 4u
at first = 528
Siti = 4u-32
R=5u
P=2u
4u-32+5u+2u=528
11u=528+32=560
u=560/11...cannot get round number leh... -
PapayaDad:
I catch no ball the first part. Thought David should be X and Siti to be 6X?
At firsttitank:
Hi All,
Siti had 6 times as many apples as David at first. After Siti had given 450 apples to David, they had an equal number of apples.
(a) Find the number of apples David had at first.
(b) David gave away some apples and had half the number of apples Siti had. How many apples did David give away.
D=2u
S=12u
In the end
D=7u....receive 5u from Siti
S=7u....give 5u to David
5u=450
u=90
At first D have 2u = 2 x 90 = 180
B)from above both have 7u = 7 x 90 = 630
D gave away half 315 -
Siti, Rahmesh & Peter had 528 stickers at first. Siti bought another 32 stickers, Ramesh gave 1/5 of his stickers away & Peter was given as many stickers as he had at first by his father. In the end, all three of them had equal number of stickers. Find the number of stickers Siti had at first.
The answer is 192 but no idea how to get. -
titank:
I catch no ball the first part. Thought David should be X and Siti to be 6X? [/quote]At first,
At firstPapayaDad:
[quote=\"titank\"]Hi All,
Siti had 6 times as many apples as David at first. After Siti had given 450 apples to David, they had an equal number of apples.
(a) Find the number of apples David had at first.
(b) David gave away some apples and had half the number of apples Siti had. How many apples did David give away.
D=2u
S=12u
In the end
D=7u....receive 5u from Siti
S=7u....give 5u to David
5u=450
u=90
At first D have 2u = 2 x 90 = 180
B)from above both have 7u = 7 x 90 = 630
D gave away half 315
D=x
S=6x
Total = 7x
In the end
D=3.5x....receive 2.5x from S
S=3.5x....give 2.5x to D
2.5x=450
x=180
At first D = x = 180
b)from above both have 3.5x = 3.5 x 180 = 630
D gave half 315
i use D=2x and S=12x at first to avoid working with decimals...
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