Question 923349
x+y=92,
2.2*x+1.8*y=192
x=92-y
2.2*(92-y)+1.8*y=192
202.4-2.2y+1.8*y=192
-0.4*y=-10.4
y=26.0
x=92-y
x=66 coffees at $2.20 and  y=26.0 teas at $1.80
check
66+26.0=92
2.2*x+1.8*y=192
2.2*66+1.8*26.0=192
145.2+46.8=192
192.0=192
ok
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