Help me with this would ya!?

Diana is painting statues. she has 7/8 of a liter of paint remaining. each statue requires 1/20 of a liter of paint.how many statues can she paint? yeah dad i added the cup to the door now will you stop emailing me while im doing my homework.(lmbo xd i just realized this wooow)

Hi, can anyone show me how to do this problem? 100 points for this. in advance

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.