# Cottages

The summer camp is 41 cottages. Rooms are for three and for four in them. How many of the 140 campers lives of three?

Correct result:

x =  72

#### Solution:

x+y = 140
x/3 + y/4 = 41

x+y = 140
4x+3y = 492

x = 72
y = 68

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