Q&A - P5 Math

[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.

[euniceloke]

Yili, Lynn and Devi went shopping. Yili spent 0.25of the total amount Lynn and Devi spent, while Devi spent 4/11 of the total amount Yili and Lynn spent. Lynn spent $37.50 more than Yili. If Lynn had $90 before she went shopping, what fraction of her money did she spend? Express your answer in its simplest form.

[CPYMUM]

Anyone interested to attend Onsponge math workshop for p6 (2012) on 7/8 Dec at $350. The workshop is fully booked. I got one slot for my kid. However, he could not make it due to sports events. Pls contact me if you are interested.

[MathIzzzFun]

euniceloke:

Yili, Lynn and Devi went shopping. Yili spent 0.25of the total amount Lynn and Devi spent, while Devi spent 4/11 of the total amount Yili and Lynn spent. Lynn spent $37.50 more than Yili. If Lynn had $90 before she went shopping, what fraction of her money did she spend? Express your answer in its simplest form.

Hi

this was discussed in an earlier post..http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=68&t=25129&start=290

cheers.

[MathIzzzFun]

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

Hi

Q1. ..\"chicken & cow\" type of question with slight twist.

Total number of buns sold = 300 - 8 = 292
Total amount collected from sales of buns = 300 x $ 1.20 + $ 240 = $600

Assume all 292 buns sold are custard buns, then total amount from sales of buns = 292 x $ 2.20 =$ 642.40 --> \"excess\" of $(642.40-600)=$42.40

$ 2.20-$1.80= $0.40 --> each custard bun cost $ 0.40 more than each hotdog bun.

Number of hotdog buns sold = $ 42.40/$0.40= 106
Number of custard buns sold = 292-106 = 186

Q2. 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.

If Mrs Lim bought 5 bowls,
bowls : plates = 3 : 5 --> number of bowls = 3u - 5, number of plates = 5u

If Mrs Lim bought 9 more plates,
bowls : plates = 3u-5 : 5u + 9 = 1 : 3
cross-multiply --> 9u-15 = 5u+9, 4u = 24, 1u =6
Number of bowls = 3u-5 = 18-5 = 13

cheers.