1. Find the area of one third of the circle, eg, POR.Laurel111 wrote: Can someone please help with this question. Thanks!

2. MINUS 2*area of triangle POR, 2*15 sqcm.

3. What is left is equal to shaded area.

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by **Nebbermind** » Thu Apr 16, 2015 8:44 am

1. Find the area of one third of the circle, eg, POR.Laurel111 wrote: Can someone please help with this question. Thanks!

2. MINUS 2*area of triangle POR, 2*15 sqcm.

3. What is left is equal to shaded area.

Last edited by Nebbermind on Thu Apr 16, 2015 12:46 pm, edited 1 time in total.

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by **Laurel111** » Thu Apr 16, 2015 12:45 pm

Nebbermind wrote:1. Find the area of one third of the circle, eg, POR.Laurel111 wrote: Can someone please help with this question. Thanks!

2. MINUS 2*area of triangle POR, 2*15 sqcm.

3. What is left you is equal to shaded area.

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by **Whitearies** » Thu Apr 16, 2015 4:31 pm

The ratio of the number of 20cents coins to the number of 50 cents coins to the number of $1 coins in a money box is 3:5:4. The difference in value between the 20cents coins and the $1 coins is $88.40. How many 50cents coins are there in the money box?

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by **Whitearies** » Thu Apr 16, 2015 4:34 pm

There were 156 more silver balloons than gold balloons at a party. After 5/6 of the silver balloons and 3/4 of the gold balloons burst, there were 106 balloons left. How many balloons were there altogether at first?

Ans from the ans sheet is 540 balloons.

There were 156 more silver balloons (Is i'm not sure whether is it 26 or 156 balloon as the working show 26 balloon)

Please help.

Thanks

Ans from the ans sheet is 540 balloons.

There were 156 more silver balloons (Is i'm not sure whether is it 26 or 156 balloon as the working show 26 balloon)

Please help.

Thanks

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by **Whitearies** » Thu Apr 16, 2015 4:37 pm

Pens and pencils were sold in packets of 2 pens and packets of 3 pencils respectively. Each packet of pens was sold at $5 and each packets of pencils was sold at $0.90. Mrs Chan bought 96 pens and pencils and paid $134.40. How many pencils did she buy?

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by **Nebbermind** » Thu Apr 16, 2015 4:57 pm

My answer is 7.68, same as beautyful minds.Isucceed wrote:Hi,

The answer is 18 x 3.142 - 2x(15) approximately 26.55 sq cm

Post
by **Laurel111** » Thu Apr 16, 2015 5:45 pm

Thank you Nebbermind and Beautyful minds for the clear explanations.Nebbermind wrote:My answer is 7.68, same as beautyful minds.Isucceed wrote:Hi,

The answer is 18 x 3.142 - 2x(15) approximately 26.55 sq cm

Post
by **BigDevil** » Thu Apr 16, 2015 6:38 pm

Let u be the number of packets of pens,Whitearies wrote:Pens and pencils were sold in packets of 2 pens and packets of 3 pencils respectively. Each packet of pens was sold at $5 and each packets of pencils was sold at $0.90. Mrs Chan bought 96 pens and pencils and paid $134.40. How many pencils did she buy?

p be the number of packets of pencils.

Number of pens bought -> 2u

Number of pencils bought -> 3p

2u + 3p = 96

x3: 6u + 9p = 288 ..........(1)

Cost of u packets of pens -> 5u

Cost of p packets of pencils -> 0.9p

5u + 0.9p = 134.40

x10: 50u + 9p = 1344 .....(2)

(2) - (1):

44u = 1056

u = 24

With u known, you should be able to find the answer.

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