The side of an equilateral triangle is 24k cm long. Find its perimeter.
1 m
Find the product of 5q and 9r.
1 m
Lina bought 5 plates and 8 bowls One plate is $3b each and 1 bowl is $2n each. How much did she pay for them?
1 m
Linda had $20. After buying 3 identical markers, she has $5z left. Express the cost of 1 marker in terms of z.
1 m
Mrs Tan and her two children received $5k in the ratio 2 : 3. If her son received $100 more than her daughter, how much did her daughter receive? Leave your answer in terms of k.
2 m
Box X is half as heavy as Box Y. Box Z is 3 times as heavy as Boxes X and Y together. What is the mass of Box Z if Box Y is n kg?
2 m
12 years ago, Donald was 8c years old.
  1. How old was Donald 5c years ago?
  2. How old will Donald be 2c years later?
2 m
PSLE
Some pupils are arranged in 4 rows. Each row has s more pupils than the row in front of it. There are 8s pupils in the second row. How many pupils are there altogether? Give your answer in terms of s in the simplest form.
2 m
Ken is 11 years old. His father is x years older than he. What will be their total age in 4x years' time?
2 m
Jim is 29 years old. His mother is b years older than him and 3b years older than Keith. Find Keith's age in terms of b.
2 m