Last month dory biked 11 times as many miles as karly. together they biked a total of 156 miles. how many miles did dory bike last month?

Dory biked 143 miles last month.

Let x be the number of miles Karly biked
Dory biked 11 times as many miles as Karly, therefor, Dory = 11x
The total number of miles back by both is 156

The equation will be:

11x + x = 156

Before we can get the number of miles Dory biked, we must first get the number of miles
Karly biked represented by x.

Get the x

12x = 156
12x/12 = 156/12
x = 13

Karly = x = 13 miles biked
Dory = 11x = 11(13) = 143 miles biked

To check:
11x + x = 156
11(13) + 13 = 156
143 + 13 = 156
156 = 156