Ratios and word problems

Question

The ratio of Jet Ski rentals to boat rentals at a store is 7 : 2. If the number of boat rentals doubles and the number of Jet Ski rentals stays the same, then the number of boat rentals is how many times the number of Jet Ski rentals? Please explain how you got your answer.

Answer 1

double 2 to get 4, keep 7 the same

double the denominator of 7/2 = 7/2(2) = 7/4 = the new ratio of ski to boat rentals