Q&A - P5 Math

[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.

[Essential]

Hi we need help to solve 2 questions :-

1) A piggy bank has a total 2562 coins consisting of one -dollar coins, fifty-cent and twenty -cent coins.3/7 of the one dollar coins and 32 of the fifty cent coins are taken out. 20 more twenty cent coins are put in. After that, there is an equal number of one-dollar , fifty -cent and twenty -cent coins in the piggy bank. How many of each type of coins are there in the piggy bank at first?

[Essential]

Mrs Tan made a jar of cookies in the morning. Out of the 2/7 which she took out. 18 were given away and the remaining 52 cookies were eaten by her children. In the evening , she made another lot of cookies and she put 1/3 of the them into the same jar as those made in the morning. After this, the toal number of cookies in the jar was 204. How many cookies did she make in the evening?

[ozora]

Anyone can solve q18 of nayang primary school final year paper? A tank measuring 50 cm by20cm by 22cm with some cubes placed inside, was filled with water 3.875l of water to the height as shown. Some water was then added into the tank. The total amt of water in the tank was then 8.375l. If another 3.9l of water was added into the tank, wat would be the final height of the water level in tank?

[MathIzzzFun]

ozora:

Anyone can solve q18 of nayang primary school final year paper? A tank measuring 50 cm by20cm by 22cm with some cubes placed inside, was filled with water 3.875l of water to the height as shown. Some water was then added into the tank. The total amt of water in the tank was then 8.375l. If another 3.9l of water was added into the tank, wat would be the final height of the water level in tank?

Hi

In the first diagram, the water is filled just enough to cover the first layer of 9 cubes. In the second diagram, water is filled just enough to cover up 2nd layer of 4 cubes.

Volume of the \"2nd layer\" - Volume of the \"1st layer\" = Volume of 5 cubes
\"1 layer\" referring to 1 cube height of water in the tank.
(8.375-3.875)-3.875=0.625l= 625 cm3
volume of 5 cubes = 625cm3, 1 cube= 125 cm3, side of each cube = 5cm
... I think you can complete the solution..

have a great weekend !

cheers.

[tianzhu]

Essential:

Mrs Tan made a jar of cookies in the morning. Out of the 2/7 which she took out. 18 were given away and the remaining 52 cookies were eaten by her children. In the evening , she made another lot of cookies and she put 1/3 of the them into the same jar as those made in the morning. After this, the toal number of cookies in the jar was 204. How many cookies did she make in the evening?

Hi

You may use MD.

First, consider the cookies made in the morning.

2 units ----- 18 + 52 ----- 70
1 unit ----- 35
5 units ----- 175 (remaining from the cookies made in the morning)

Next, go the evening part.

204 – 175 ----- 29
1 unit ----- 29

3 units ----- 87(cookies made in the evening)

Best wishes