Q&A - P5 Math

[YumYum]

Need help with 1 more Qn:


Mrs Lee knitted many scarves for sale. 3/5 of them were black scarves and the rest were white scarves. After selling 120 white scarves and 5/9 of the black scarves, she had 2/5 of the scarves left. How mant scarves did she sell in all?

Thanks

[MathIzzzFun]

YumYum:

Need help with 1 more Qn:


Mrs Lee knitted many scarves for sale. 3/5 of them were black scarves and the rest were white scarves. After selling 120 white scarves and 5/9 of the black scarves, she had 2/5 of the scarves left. How mant scarves did she sell in all?

Thanks

Hi

using units....

Total number of scarves = 15 units
black scarves = 9 units
white scarves = 6 units

so, 15 units = black sold + white sold + left
15 units = 5 units + 120 + 6 units
4 units = 120, 1 unit = 30
Sold = 5 units + 120 = 270

cheers.

[MathIzzzFun]

YumYum:

Hi, need help with the foll Qns:


Henry Park 2010, paper 2, Qn 12.

(Apologies, I am having some problem in uploading the picture)

Thanks

Hi

Total volume of water in tank A (before)
= Volume of water in Tank A (after) + Volume of water in tank B (after)
= height x (Base Area of A) + height x (Base area of B)

I think you can complete the solution from here..

cheers.

[YumYum]

MathIzzzFun:

YumYum:

Need help with 1 more Qn:


Mrs Lee knitted many scarves for sale. 3/5 of them were black scarves and the rest were white scarves. After selling 120 white scarves and 5/9 of the black scarves, she had 2/5 of the scarves left. How mant scarves did she sell in all?

Thanks

Hi

using units....

Total number of scarves = 15 units
black scarves = 9 units
white scarves = 6 units

so, 15 units = black sold + white sold + left
15 units = 5 units + 120 + 6 units
4 units = 120, 1 unit = 30
Sold = 5 units + 120 = 270

cheers.

Thanks. My son also worked out the answer to be 270 but the answer given is 450. If I work backword for 270, it doesn't seem to be right as 2/5 of the scarves will be 108 and they sold 120 of them. Any explanation? :?

[tianzhu]

YumYum:

Thanks. My son also worked out the answer to be 270 but the answer given is 450. If I work backword for 270, it doesn't seem to be right as 2/5 of the scarves will be 108 and they sold 120 of them. Any explanation? :?

Hi

The number of scarves sold is 270.

The total number of scarves Mrs Lee knitted is 450.

Hence , she has 2/5 *450 or 180 white scarves in the beginning.

Best wishes

[YumYum]

Okie, yeah! thanks

[tianzhu]

euniceloke:

Willy and Peter have $256. Willy spent 0.5 of his money on a shirt while Peter spent 0.4 of his money on a bag. The bag cost $8 more then the shirt. How much money did Willy have at first

Hi

Please check your question.

Best wishes

[Operation]

Hi,


Would like to request help to solve these 2 maths questions, kindly show your detailed working steps :

1 ) Mr Tan purchased a total number of 300 hotdog buns and custard buns. Each bun cost $1.20. He sold each custard bun at $2.20 and each hotdog bun at $1.80. He gave the remaining 8 buns to his wife. After deducting the amount he paid for buying all the buns, he found that he had earned $240 in total. Find the number of the hotdog buns and the number of custard buns sold by Mr. Tan

2) Mrs Lim bought some bowls and plates. If she buys another 5 bowls, there are 60% as many bowls a plate. If she buys another 9 plates, there will be thrice as manay plates as bowls. How many bowls did she buy.

Thanks in advance

[ozora]

I have enough money to buy 3 bowls n 1mug. If I were to buy 1 bowl n 2 mugs, I would need$1 more.each mug cost $5. How much money did I have?

I used algebra to solve it n got $11. Any other alternative method?

[linden2000]

ozora:

I have enough money to buy 3 bowls n 1mug. If I were to buy 1 bowl n 2 mugs, I would need$1 more.each mug cost $5. How much money did I have?

I used algebra to solve it n got $11. Any other alternative method?

Buying 2 mugs instead of 1 should cost $5 more since 1 mug costs $5. Yet only $1 more was needed. So buying 2 fewer bowls must have saved $4.
1 bowl hence costs $2.
So 3 bowls n 1 mug costs 3x2 + 5= $11.