An office girl buys 12cent and 8cent stamps. It she spends
1 answer:
Answer:
x=25
Step-by-step explanation:
x+y=100 (y being number of 8¢ stamps)
12x+ 8y = 900
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y = 100-x
12x + 8y = 900
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12x + 8(100-x) = 900
12x + 800 - 8x = 900
12x - 8x = 900 - 800
4x = 100
x=25
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