What is a similar expression to this (4.25 + 1.25) x (5.75 + 0.75) ??

Students are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. there are 15 questions on the test, and students are given 51 minutes to take it.how many multiple-choice questions are on the test?

Can somebody me out with this question

If eh = hg and hg=16, find the diameter of k