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Wardy
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A cookie and a coffee cost $1.10 in total. The cookie costs $1.00 more than the coffee. How much does the coffee cost?

 

 

X + Y = 1.10 (1)

X = 1.00 + Y (2)

 

substitute (2) into (1)

 

1.00 + 2Y = 1.10

 

2Y = 0.10

Y = 0.05

 

Coffee costs 5 cents, cookie 1.05$

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Also... I win

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