Aircraft models

How many car models did the collector own after the collector's market? The collector of car and aircraft models owned 3 times more car models than aircraft. He sold 7 car models and 9 aircraft models on the stock exchange and bought 12 car models and 4 aircraft models. Then he had 5 times more car models in his collection than airplane models.

Correct result:

a =  50

Solution:

 a+712=3 (l+94) a=5 l=50  a3l=20 a5l=0  a=50 l=10



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