Correct Ans:72 °
Solution:The angles which sum up to 90° are complementary angles. The angles which sum up to 180° are supplementary angles.
Let the unknown angle be x°. So the complement of x° will be (90 - x)°. And the supplement of x° will be (180 - x)°
According to the given data, 4 times the measure of complement of x° which is (90 - x)° is equal to 2/3 the measure of supplement of x° which is (180 - x)°. So in equation form we can write it as:

So the measure of angle will be 72°