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 Forum Index >  Test Paper Related >  Primary 4 Matters
 Fraction again
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By: pearldyn (offline)  Thursday, August 19 2010 @ 02:48 AM CDT (Read 1373 times)  
pearldyn

Help!!

There are 380 children at the Children's Carnival. 3/7 of the boys and 2/3 of the girls are watching the magic show.
The number of girls who are not watching the magic show is equal to the number of boys who are not watching the magic show.
How many boys are at the Children's Carnival?

Thanks for your help!

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By: lilyofevalley (offline)  Monday, August 23 2010 @ 03:45 AM CDT  
lilyofevalley

view attached.

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By: tanhuimin (offline)  Tuesday, August 24 2010 @ 10:45 PM CDT  
tanhuimin


Drawing model such that
4u of boys = 1U of girls, see attached jpg


represent all the children using u
7u + 12u = 380
19u = 380
u = 380/19 = 20
Total no. of boys = 7 x u = 7 x 20 = 140

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By: jas.soliano (offline)  Thursday, August 26 2010 @ 01:13 PM CDT  
jas.soliano

May I offer my solution using fraction

Question:

There are 380 children at the Children's Carnival. 3/7 of the boys and 2/3 of the girls are watching the magic show.
The number of girls who are not watching the magic show is equal to the number of boys who are not watching the magic show.
How many boys are at the Children's Carnival?

Answer:

1- 3/7 = 4/7 (boys not watching)
1-2/3 = 1/3 (girls not watching)

Make numerators the same.

4/7 = 4/12

Therefore there are 7parts boys and 12parts girls in all.

19u -> 380
1u -> 20

Boys -> 20 x 7 = 140

Easier than drawing a model. Basically you can even work this out mentally with fractions

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