Find the time she spent on other activities

Question

She spent a total of eight whole five by sixteen hours of the total on community service she spent four by seven of the total time on old folks home find the time she spent on old folks home and find the time she spent on the other activities

Answer 1

8 5/16 - 4/7

The LCM of 16 and 7 is 112.

8 35/102 - 64/102

Well, we can't subtract 35 - 64, so we can do one of two things. You decide which you like better.

8 35/102 - 64/102 = 851/102 - 64/102 = 787/102 = 7 73/102

Orrrr, we borrow 1, or 102/102 from 8.

8 35/102 - 64/102 = 7 (102 + 35)/102 - 64/102 = 7 137/102 - 64/102 = 7 73/102