Question

A baby gains 11 pounds in its first year of life. The baby gained 4 1/4 pounds during the first four months and 3 1/2 pounds in its second four months. How much did the baby gain in the last four months?

Answer 1

first four months growth + second four months growth + third four months growth = total year's growth

so total year's growth - first four - second four = third four months growth

plugging in values from the problem

11 - 4 and 1/4 - 3 and 1/2 = ?