Answer:
16
Step-by-step explanation:
Let S is smart car and T is Toyota car
Case 1: 6 smart cars and 7 Toyota's = 6S + 7T
Case 2: 8 smart cars and 4 Toyota's
When 2 smart cars increase = 3 Toyota's cars descrease
So the ratio between them is:
2S = 3T
<=> S= 3/2T
so the maximum number of toyotas aboard the ferry
6*3/2T + 7T = 16 T