adrew hiked 2 trails. the first trail was 3 1/4 miles long. the second trail was 3 times as long as the first one. how many miles did andrew hike?

so you need to know how much is 3 1/4 miles times 3

to make it simpler

3*3=9

then you have the three 1/4ths

1/4+1/4+1/4=3/4

so now you have 9 3/4 but remember you have to add back the first trail that was 3 1/4

9 3/4 + 3 1/4 = 13

so the answer is 13