Pizza: 18$/piece
Sub: 11$/piece
Let x be the number of Pizzas
Let y be the number of Subs
x+y = 20
Total spend = 304$
18*x + 11*y = 304 -------------------(1)
Multiply by 11 on both sides
11*x + 11*y = 20*11
Subtract the above from 1
7*x = 304-220 =84
x = 12
y = 8
No. of Pizzas is 12 and No. of Subs is 8
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