Q&A - P5 Math

[tianzhu]

Trevortan:

3. Jacintha and Isabel shared a number of cookies in the ratio 2:1. The number of cookies that Jacintha had was 1/4 of the number of cookies Evelyn had. If Evelyn had 63 more cookies than Isabel, how many cookies did the three of them have altogether?

Hi

You may use MD or work using units.

Jacintha and Isabel shared a number of cookies in the ratio 2:1.

J ------ 2 units
I ------ 1 unit

The number of cookies that Jacintha had was 1/4 of the number of cookies Evelyn had.

E ------- 8 units

7 units ------ 63 (If Evelyn had 63 more cookies than Isabel?)

1 unit ------ 9

Total number of cookies ------- 11*9 ------ 99

Best wishes

[tianzhu]

Trevortan:

2. A figure is made up of a rectangle and a square. The ratio of the area of the square to that of the rectangle is 2:5. If 1/4 of the square is shaded, what fraction of the figure is unshaded?

Hi

Is there a diagram provided in this question?

Square:Rectangle ------ 2:5 ------ 4:10

Fraction of figure@unshaded ------ 12/13

Best wishes

[tianzhu]

Trevortan:

1. A survey shows that the students of Chesvoire School come to school either by bus, MRT or by private transport. 2/5 of the students come to school by bus. The remaining students travel to school by MRT and private transport in the ratio 3:4. Given that 180 more students take the school bus than private transport, how many students are there in Chesvoire School?

Hi

Good Morning.

It helps to draw MD. You may also work using units.

Bus:MRT+Private transport ------ 2:3 ------ 14:21

MRT:Private Transport ------ 3:4 ------ 9:12

Bus ------ 14 units

MRT ------ 9 units

Private transport ------ 12 units

2 units ------- 180

1 unit ------- 90

Number of students ------- 35*90 -------- 3150

Best wishes

[doraemo]

oic…

Thank you MathIzzzFun & tianzhu !!!

[Jamesbond]

Grandma had some yellow and purple sweets in the ratio of 9:7. On Monday, she made 54 more yellow sweets. On Tuesday she gave away 44 purple sweets and sold 129 yellow sweets. The number of yellow sweets to the number of purple sweets became in the ratio of 6:5. How many yellow sweets are there in the end?

Pl help…

[Jamesbond]

tianzhu:

Jamesbond:

Using 3/5 of her money, Chloe could buy 11 notebooks. If she was given an extra $2, she could use it together with the remaining amount of money to buy another 8 such notebooks. How much money did Chloe have?

Hi

3 units ------ 11NB

2 units + 2 ------ 8NB

Make the number of NB equal

24 units ------- 88NB

22 units + 22 ------- 88NB

24 units ------- 22 units + 22

1 unit ------- 11

Chloe --------- 5*11 ------ 55

Best wishes

Thx Tianzhu

[tianzhu]

Jamesbond:

Grandma had some yellow and purple sweets in the ratio of 9:7. On Monday, she made 54 more yellow sweets. On Tuesday she gave away 44 purple sweets and sold 129 yellow sweets. The number of yellow sweets to the number of purple sweets became in the ratio of 6:5. How many yellow sweets are there in the end?

Pl help...

Hi

This question has been discussed before in this thread.

Hope this helps

Best wishes

http://farm8.staticflickr.com/7210/6837707220_51b42ebf08_z.jpg\">

[Jamesbond]

tianzhu:

Jamesbond:

Grandma had some yellow and purple sweets in the ratio of 9:7. On Monday, she made 54 more yellow sweets. On Tuesday she gave away 44 purple sweets and sold 129 yellow sweets. The number of yellow sweets to the number of purple sweets became in the ratio of 6:5. How many yellow sweets are there in the end?

Pl help...

Hi

This question has been discussed before in this thread.

Hope this helps

Best wishes

http://farm8.staticflickr.com/7210/6837707220_51b42ebf08_z.jpg\">

:? :nailbite: am still not able to follow....

[carol73]

Wilson spent equal amounts of money on 5 exercise books and 7 pencils. Each exercise book cost 30cents more than each pencil. How much did Wilson spend altogether?

[tianzhu]

Jamesbond:

:? :nailbite: am still not able to follow....

Hi

This is a typical question on “Units and Parts”.

The tricky part in this question is changes are made in two stages unlike the common questions where you have single stage change.

For the yellow sweets, grandma made 54 sweets on Monday and sold 129 sweets on Tuesday, this gives a deficit of 75 (129-54)

9 units – 75 -------- 6 parts

7 units – 44 -------- 5 parts

Equalise the parts

45 units – 375 ------- 30 parts

42 units - 264 -------- 30 parts

45 units – 375 -------- 42 units - 264

From here 1 unit ------- 37

Best wishes