Question

Hank used 3 1/2 bag of seed to plant grass in his front yard. He uses 3 times as much seed to plant grass in his backyard. How much seed did hank need for the backyard

Answer 1

10 1/2
you just have to multiply 3 1/2 and 3
3 1/2*3=10 1/2

Answer 2

he used 3 1/2 bags of seed for the front......he used 3 times as much for the back

so he used :
3 * 3 1/2 =
3 * 7/2 =
21/2 =
10.5 (or 10 1/2) bags for the back yard <==