There are Year 8 pupils and y Year 9 pupils. If 10 pupils from each year group left the school, the ratio of pupils in Year 8 to Year 9 would be 2:5.If 8 pupils were added to each year group, the ratio would be 1 : 2. Express . pls help me

Taber invested money in an account where interest is compounded every year.he made no withdrawals or deposits. the function a(t)=525(1+0.05)^t represent the amount of money in the account after t years. how much money did taber origanally invested?