Ross is twenty years older than his niece krystal. krystal has worked out that in five years' time her uncle will be twice as old as she will be. find krystal's age. would be great if you could answer/explain this.

You are cycling around europe with friends. you book into a hostel and you ask the owner what the ratio of men to women is currently staying there. there are 24 men and 6 women. what is the ratio of men to women in its simplest form?

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

From the beginning of the day the temperature rose 15 degrees so that by 4 pm it was 87 degrees. what was the temperature at the start of the day