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

The baby gained 4¼ + 3½ = 7¾ pounds during the first eight months. Subtract that from the total: 11 − 7¾ = 3¼ pounds. So the baby gained 3¼ pounds in the last four months, which is choice A.

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