Question

Sarah's new puppy weighed 5 2/7 pounds. After a month it had gained 5 7/10 pounds.

What is the weight of the puppy after a month? Answer as a mixed number.

Answer 1

769/70

Explanation:

5 2/7 = 37/7

5 7/10 = 57/10

The lowest common multiple is 70

37*10/(7 * 10) = 370/70

57/10 = 57*7/(7*10) = 399/70

Now add

370/70 + 399/70

769/70

Is 769 prime? I think it might be.

Yes it is.