Q&A - P5 Math

[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

[tianzhu]

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?

Hi

It helps to draw some simple diagram.

Cost of 7 pencils ------- Cost of 5 exercise books

Let cost of 1 pencil ------ 1 unit

Hence, cost of 1 exercise book ------- 1 unit + 30

7 units ------- (1 unit + 30)*5

7 units ------- 5 units +150

2 units ------ 150

1unit ------- 75

7 units ------- 525

Amount spend altogether -------- 525*2 ------- 1050 ------- $10.50

Best wishes

[Jamesbond]

tianzhu:

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?

[Jamesbond]

Hakim and suresh had some money in the ratio 13:8. When they each received $133, hakim will have 4 times as much money as Suresh. How much did hakim had at first?

Pl help…

[Jamesbond]

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

Gotcha :salute: :thankyou:

[tianzhu]

Jamesbond:

Hakim and suresh had some money in the ratio 13:8. When they each received $133, hakim will have 4 times as much money as Suresh. How much did hakim had at first?

Pl help...

Hi

Please confirm with your source.

I think \"received\" should be read as \"gave away\".

Hakim and Suresh had some money in the ratio of 13 : 8. When they each gave away $133, Hakim will have 4 times as much money as Suresh. How much did Hakim had at first?

The answer for the revised question is 273.

Best wishes

[carol73]

tianzhu:

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?

Hi

It helps to draw some simple diagram.

Cost of 7 pencils ------- Cost of 5 exercise books

Let cost of 1 pencil ------ 1 unit

Hence, cost of 1 exercise book ------- 1 unit + 30

7 units ------- (1 unit + 30)*5

7 units ------- 5 units +150

2 units ------ 150

1unit ------- 75

7 units ------- 525

Amount spend altogether -------- 525*2 ------- 1050 ------- $10.50

Best wishes

thanks

[amaizziq]

Hi… I need some help.


How do you find the sum of 11, 12, 13, 14, …, 58, 59, 60 ?

The question sounds easy but I do not know how to do it a better way instead of adding from 11 to 60 manually.

Thanks in advance!

[carol73]

After 35 kittens, some puppies and rabbits were sold, there were 65 animals left. There were thrice as many rabbits as puppies left. There were 26 fewer kittens left than the rabbits left. How many rabbits and puppies were sold? (44)