Q&A - P5 Math

[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)

[carol73]

Helen and Dorothy have some marbles. If Helen gives Dorothy 15 marbles, both of them will have the same number of marbles. If Dorothy gives Helen 15 marbles, Helen will have twice as many marbles as Dorothy. How many marbles does each girl have

[tianzhu]

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)

Hi

Please check with your source. I think some information may be missing.

A similar question was discussed earlier in this thread.

A pet farm had the same number of kittens, puppies and rabbits at first. 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?

You may use MD.

In the end, the number of animals left is:

Rabbits ----- 3 units
Puppies ----- 1 unit
Kittens ------ 3 units – 26

7 units ------ 65+26 ------91
1 unit ------ 13

Number of rabbits left ------ 3*13 ------ 39
Number of puppies left ------- 13

Number of kittens at first ------ 13+35 ------- 48

Number of rabbits sold ------ 48 – 39 ------ 9
Number of puppies sold ------- 48 – 13 ------ 35

The answer is (35+9) or 44

Best wishes