Q&A - P5 Math

[MathIzzzFun]

cookieandmonster:

Please help.


Fang had some boxes of fruits for sale. She sold 35 boxes on Monday. She sold 1/5 of the remaining boxes of fruits on Tuesday. Then she had 1/3 of the total number of boxes of fruits left. How many boxes of fruits did she have at first?

Using equal fractions method:

4/5 remainder = 1/3 Total = 4/12 Total
Total -> 12 units
Remainder -> 5 units
7 units -> 35
Total -> 35/7 x 12 = 60

cheers.

[MathIzzzFun]

veraclari:

Hi Parents


Just wondering. . For some Fractions Ratio why must we change the numerator to common multiple?

Eg. Lyn and Jen had 160 marbles. After LYN SOLD 3/5 Of her marbles , Jen sold 4/7 of hers, they had the same no. Of marbles left.
How many did Lyn has at first?

The Model Answer gave step 1 as changing the numerator to the same numerator. Why must they do that?


Another qn also same step 1 : 2/3 of Shaun's money is equal yo 4/5 of Micah's money. If Shaun gives $240 to Micah, yhey each will have e same amount of money. How much money does Shaun have? How much money do they have altogether?
Thanks A lot!!!

Hope this helps :

explanation of equal fraction method -
http://www.tinyurl.com/mathizzzfun-equalfractions

questions posted in the forum:

1) Esther had $350 more than Kevin. Ester spent 3/4 of her money & Kevin spent 4/7 of his money. In the end, Kevin & Esther had the same amout of money left. Find the amout of money Kevin had at first.

2)At the graduation ceremony, there were 30 less boys than girls.After 3/5 of the boys & 5/8 of the girls had left the hall for recess, there was an equal number of boys & girls that remained behind. Find the number of boys who were presented at the graduation ceremony at first.
@ http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=67&t=25121&hilit=equal+fraction&start=1260

Carol paid $72 for 2 blouses and 1 dress.5 blouses cost as much as 2 dresses.How much more did she pay for each dress than a blouse?
@ http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=67&t=25121&p=867458&hilit=equal+fraction#p867458

Mary spent $16.50 of her pocket money on a compact disc. She spent 1/5 of the remainder on a story book. She still had half of her money left.
a) How much was the storybook
b) How much was her pocket money?
@ http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=68&t=25129&p=816918&hilit=equal+fraction#p816918

James and Bond had $728 altogether. When James spent 1/4 of his money and Bond spend 2/3 of his, they found out that each had an equal amount of money left. How much did James have at first ?
@ http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&p=961760&hilit=equal+fraction#p961760

There were 3/5 as many adults as children on a bus.At the next stop 6 adults and 6 children boarded the bus.As a result,there were 2/3 as many adults as children on the bus.How many people were on the bus at first?
@ http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=68&t=25129&p=960597&hilit=equal+fraction#p960597

Jenny had 3/7 as much money as Kenny. If they spent $252 each, Jenny's money will be only 2/7 of Kenny's. How much money did Kenny have more than Jenny
@ http://www.flickr.com/photos/mathizzzfun/8612801525/in/set-72157633150783002

cheers.

[2Transformer]

Hi, can someone help me on this question?



Keith had a number of books for sale. He sold 560 books on Saturday. On Sunday, he sold 1/5 of the remaining books and was left with 40 books. How many books did he have at first?

[veraclari]

Thanks A lot Mathizzfun!!!


I’ve seen quite a few qn and answers but still didn’t understand WHY they did it this way but the link to ur page sure help explaining LoTs!!!

Thanks!

[vsk]

In a hall, 1/3 of the pupils were lined up in 7 long rows and 4/9 of the pupils were lined up in 12 short rows. The rest of the pupils were seated on the stage. Each long row had 10 more pupils than each short row.


Q: How many pupils were lined up in rows and what is the fraction of pupils seated on the stage ?

Kindly help with this question ?. Thank you.

[MathIzzzFun]

vsk:

In a hall, 1/3 of the pupils were lined up in 7 long rows and 4/9 of the pupils were lined up in 12 short rows. The rest of the pupils were seated on the stage. Each long row had 10 more pupils than each short row.


Q: How many pupils were lined up in rows and what is the fraction of pupils seated on the stage ?

Kindly help with this question ?. Thank you.

Fraction of pupils seated on stage = 1-1/3-4/9 = 2/9

1/3 of pupils = 3/9 of pupils
7 long rows = 7 short rows + 7 x 10 = 7 short rows + 70
7 short rows + 70 --> 3/9 of pupils

4/9 of pupils in 12 short rows
12 short rows --> 4/9 of pupils
9 short rows --> 3/9 of pupils

so, 9 short rows = 7 short rows + 70
1 short row --> 35
1 long row --> 45

Pupils in rows --> 7 x 45 + 12 x35 = 735

cheers.

[2Transformer]

2Transformer:

Hi, can someone help me on this question?



Keith had a number of books for sale. He sold 560 books on Saturday. On Sunday, he sold 1/5 of the remaining books and was left with 40 books. How many books did he have at first?

Pls help me to solve this question. Thank you.

[2Transformer]

I have another question.



A watch cost $120 more than a bag. Janet used 1/3 of her money to buy the bag and was then short of $50 to buy the watch. How much did Janet have at first?

[Oldschool]

2Transformer:

2Transformer:

Hi, can someone help me on this question?



Keith had a number of books for sale. He sold 560 books on Saturday. On Sunday, he sold 1/5 of the remaining books and was left with 40 books. How many books did he have at first?

Hi,

http://i44.tinypic.com/2zyizqg.jpg\">

Regards

[Oldschool]

2Transformer:

I have another question.



A watch cost $120 more than a bag. Janet used 1/3 of her money to buy the bag and was then short of $50 to buy the watch. How much did Janet have at first?

Hi,

http://i44.tinypic.com/nxw3gw.jpg\">

Regards