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

D= 11K D + K = 156 Substitute D= 11K into the second equation. 11K + K = 156 12K = 156 Divide both sides by 12 K = 13 D = (11)(13) D = 143 miles