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 Math problem sum
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By: hoo_2000 (offline)  Saturday, February 18 2012 @ 08:42 PM CST (Read 1046 times)  
hoo_2000

Can somebody help me solve these questions?

Q1:If Tom buys 4 identical pairs of slippers,he will have $9 left.
If he buys 7 identical pairs of slippers,he will be short of $45.
How much does he have?

Q2:Mrs Chan had some bookmarks.She gave 50% of the bookmarks to her sister and 10% of the remainder to her brother and the rest to 5 children.
If each child receives 36 bookmark,how many bookmarks did she have at first?

Q3:There are 8 people in a room.If every person shakes hands with every other person,
how many handshakes are there altogether?

Q4: Terrence's age is 3\8 that of Sabrina's age.Candice's age is 2\9 that of Terrence's age.Find the ratio of Candice's age to Sabrina's age?

Q5:40% of Paul's age is the same as 25% of James' age.Their total age is 130 years.Find Paul's age in 20 years' time.

For those who will be helping me to solve these questions,thanks in advance. Big Grin Big Grin

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By: awyw1201 (offline)  Sunday, February 26 2012 @ 07:59 AM CST  
awyw1201

Q1

Let the cost of 1 pair of slippers be 1u.

Thus, 4u + 9 = 7u -45
3u = 54
1u = 18

18 x 4 + 9 = 81

Ans: $81


Q2


5 children-----90% x 50% = 45%
1 child----9%===36
1%==4
100%==400

Ans: 400 bookmarks


Q3


7 + 6 + 5 + 4 + 3 + 2 + 1 = 28

Ans: 28 handshakes



Q4


T : S----3 : 8= 9 : 24
T : C----9 : 2
Ratio---2 : 24 = 1 : 12


Ans: 1 : 12


Q5:40% of Paul's age is the same as 25% of James' age.Their total age is 130 years.Find Paul's age in 20 years' time.

Paul : James = 2/5 : 1/4 = 2/5 : 2/8 = 5 : 8
13u --- 130
1u ----10
Paul's current age---10 x 5 = 50
50 + 20 = 70

Ans: 70 yrs old

Hope this is not too late


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