Q&A - P5 Math

[MathIzzzFun]

ttyh:

A group of girls was seated in a circle. A box of 115 sweets was passed around in a clockwise direction, starting from Mary. Each girl took a sweet each time the box was passed to her. If Mary took the last sweet in the box, she would have taken a total of 7 sweets. How many girls were there in the group?

115-1 = 114 --> 114 sweets passed 6 full rounds ie every girl took 6 sweets.

Number of girls in the group = 114/6 = 19

cheers.

[MathIzzzFun]

ttyh:

an elevator can carry either 159 adults or 186 children at one time. Given that 62 children are already in the elevator, how many adults can still get into the elevator?

186 children --> 159 adults
62 children --> 53 adults

159 - 53 = 106 --> 106 more adults can get into the elevator.

cheers.

[MathIzzzFun]

ttyh:

Carina and Leslie shared some sweets. if Carina received 8 sweets from Leslie, the ratio of the number of sweets she had to the number of sweets Leslie had would be 3:1. If Leslie received 24 sweets from Carina, he would have the same number of sweets from Carina. What was the total number of sweets shared?

If carina received 8 sweets from Leslie,
Carina's sweets : Leslie's sweets --> 3u : 1u

At first,
Carina's sweets : Leslie's sweets --> 3u-8 : 1u+8

If Leslie received 24 sweets from Carina ,
Carina's sweets : Leslie's sweets
--> 3u-8-24 : 1u+8+24
= 3u - 32 : 1u + 32

3u - 32 = 1u+32
1u --> 32

Total number of sweets shared between them --> 4 x 32 = 128

cheers.

[janicelhl]

点击[http://pinyin.cn/1gS5ugsIBs7] 查看这张图片。

[Jamesbond]

MathIzzzFun:

ttyh:

A group of girls was seated in a circle. A box of 115 sweets was passed around in a clockwise direction, starting from Mary. Each girl took a sweet each time the box was passed to her. If Mary took the last sweet in the box, she would have taken a total of 7 sweets. How many girls were there in the group?

115-1 = 114 --> 114 sweets passed 6 full rounds ie every girl took 6 sweets.

Number of girls in the group = 114/6 = 19

cheers.

Hi MathIzzzFun,
Can u pl clear my doubt in this sum.... :?
I worked out as
7 girls....7 sweets
11 girls....6 sweets..
And got 18...
Pl enlighten me.....

[MathIzzzFun]

Jamesbond:

MathIzzzFun:

[quote=\"ttyh\"]A group of girls was seated in a circle. A box of 115 sweets was passed around in a clockwise direction, starting from Mary. Each girl took a sweet each time the box was passed to her. If Mary took the last sweet in the box, she would have taken a total of 7 sweets. How many girls were there in the group?

115-1 = 114 --> 114 sweets passed 6 full rounds ie every girl took 6 sweets.

Number of girls in the group = 114/6 = 19

cheers.

Hi MathIzzzFun,
Can u pl clear my doubt in this sum.... :?
I worked out as
7 girls....7 sweet
11 girls....6 sweets..
And got 18...
Pl enlighten me.....[/quote]
If Mary took the last sweet, she would have 7 sweets -> the rest had 6 sweets so, we remove the extr sweet from Mary, then she will have same number of sweets as the rest - 6 sweets.
This means total of 115-1= 114 sweets distributed to all the girls.
Number of girls = 114÷6 = 19

cheers.

[ttyh]

Thanks for solving my previous questions…

There were 87 children at a party. After 1/3 of the boys and 2/7 of the girls left the party, there were an equal number of boys and girls at the party. How many children remained at the party?

[The Right Equation]

ttyh:

Thanks for solving my previous questions....

There were 87 children at a party. After 1/3 of the boys and 2/7 of the girls left the party, there were an equal number of boys and girls at the party. How many children remained at the party?

first method recommended.

http://i39.tinypic.com/30vevq1.jpg\">

[Jamesbond]

Gotcha MathIzzzFun…Thx.

[Charnic]

Pls help.

During a sale, Wilson spent $120 on a pair of shoes. He spent 2/5 of the remaining money on a bag and a book. After his spending, Wilson realized that he had 1/3 of his money left. If the book cost 1/2 as much as the bag, how much is the bag.
Thanks in advance