A student bought some pens at rs.8 each & some pencils at rs.1.50?each if total no. Of pens & pencils purchased is rs.16 total cost rs-50 how many pens did he buy?
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8x+1.5y=50
x+y=16
y=16-x
so,8x+1.5(16-x)=50
so,8x+24-1.5x=50
so,6.5x=26
x=4,y=12
4 pens,12 pencils
x+y=16
y=16-x
so,8x+1.5(16-x)=50
so,8x+24-1.5x=50
so,6.5x=26
x=4,y=12
4 pens,12 pencils
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