Work out the percentage change when a price of £25 is increased to £30.

A woman is 4 times as old as her son. 9 years ago, the sum of their ages was 42. Find their present ages

In a chemical compound there are three parts zinc for every 16 parts copper by mass. A piece of the compound contains 320 g of copper. Write and solve an equation to determine the amount of zinc in the chemical compound.

A town accumulated 2 inches of snow and the depth is increasing by 6 inches every hour. A nearby town ha accumulated 9 inches of snow and the depth is increasing by 3 inches every hour.

What is 13 1/3% in a fraction (simplest form) ?

A wedding planner uses 72 ivy stems for 18 centerpieces. When she arrives at the venue, she realizes she will only need 16 centerpieces. How many ivy steams should she use so that the ratio of ivy stems to centerpieces stay the same?

what is 6/21 simplified

What's a prime factor of 28

You eat 3/10 of a pack of hotdogs, your friend eats 1/5 of the pack of hotdogs. what fraction of the hotdogs did you and your friend eat?

Explain how to determine if the two expressions are equivalent using x = 6 and x = 2.

2 (2x-1) = -2 (1+3x) solve for x