A fisherman

A fisherman buys carnivores to fish. He could buy either 6 larvae and 4 worms for $ 132 or 4 larvae and 7 worms per $ 127. What is the price of larvae and worms? Argue the answer.

Correct result:

l =  16
w =  9


6l+4w = 132
4l+7w = 127

6•l+4•w = 132
4•l+7•w = 127

6l+4w = 132
4l+7w = 127

l = 16
w = 9

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