The ratio of the measures of two complementary angles is 7:8 what is the measure of the largest angle

complimentary angles add up to 90

7:8.....added = 15......this means that 7/15 of 90 is one angle and 8/15 of 90 is the other angle.

7/15 * 90 = 42
8/15 * 90 = 48 <== largest angle