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 <span>x = 13 </span> Karly = x = 13 miles biked Dory = 11x = 11(13) = 143 miles biked to check: 11x + x = 156 11(13) + 13 = 156 143 + 13 = 156 <span>156 = 156 i hope it helps have a nice day:)