Question 638451
'Marty buys some stamps. He buys 50 cent and 75 cent stamps to the value of $12.50. Altogether, he buys 21 stamps. How many of each type of stamp does he buy?
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let x=no. of 50 cent stamps Marty bought
21-x=no. of 75 cent stamps Marty bought
..
.50x+.75(21-x)=12.50
.50x+15.75-.75x=12.50
.25x=3.25
x=3.25/.25=13
21-x=8
no. of 50 cent stamps Marty bought=13
no. of 75 cent stamps Marty bought=8