Cottages

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

Correct answer:

x =  72

Step-by-step explanation:


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

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

Pivot: Row 1 ↔ Row 2
4x+3y = 492
x+y = 140

Row 2 - 1/4 · Row 1 → Row 2
4x+3y = 492
0.25y = 17


y = 17/0.25 = 68
x = 492-3y/4 = 492-3 · 68/4 = 72

x = 72
y = 68

Our linear equations calculator calculates it.



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