Need help to solve a few problem sums. Thank you.

1) Ailing's mother is P years old. Ailing is 3 times younger than she is. Their total age is ______ years.

2) Xiaoming received $460 during chinese new year. He received 35% from his relatives and $80 from his parents. The remaining amount was from his parents' friend. What % of xiaoming's money was from his parents' friend? (my ans is 48% but correct ans 40%)

3) The ratio of the number of stamps Kathy has to the number of stamps Jessie has is 6:7. The ratio of the number of stamps Kathy has to the number of stamps Jane has is 2:4. Jane has 15 more stamps than Jessie. How many stamps do the three of them have altogether? (I got 75 but correct ans 84 stamps)

4) There are 108 balls in room A and room B. Room B and room C have a total of 134 balls. The number of balls in room A is 3/5 the number of balls in room C. How many balls are there in the three rooms altogether?

Some very quick answers ....


1) Ailing's mother is P years old. Ailing is 3 times younger than she is. Their total age is ______ years.

Try using fractions for this ... P + P/3 --> 3/3P + 1/3P --> 4/3P

2) Xiaoming received $460 during chinese new year. He received 35% from his relatives and $80 from his parents. The remaining amount was from his parents' friend. What % of xiaoming's money was from his parents' friend? (my ans is 48% but correct ans 40%)

Your answer is correct.

3) The ratio of the number of stamps Kathy has to the number of stamps Jessie has is 6:7. The ratio of the number of stamps Kathy has to the number of stamps Jane has is 2:4. Jane has 15 more stamps than Jessie. How many stamps do the three of them have altogether? (I got 75 but correct ans 84 stamps)

Your answer is correct.

4) There are 108 balls in room A and room B. Room B and room C have a total of 134 balls. The number of balls in room A is 3/5 the number of balls in room C. How many balls are there in the three rooms altogether

I shall start you off. See if you can finish the solution.
A+B --> 108
C+B --> 134
C-A --> 26

So now you know, C-A --> 26 and A is 3/5C. From here you should be able to work out A,B,C and therefore the total. (A=39,B=69,C=65)

Thank you for your help