5 pens 1 book together cost rupees 225 cost of 10 pen is equal to cost of 1 book . find the total of 3 pens and 2 books
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5x+y =225
10x=y
x=y/10
5*y/10+y=225
y/2+y=225
3y/2=225
3y=225
y=75 now
x=225-y/5
x=225-75/5
x=150/5
x=30
now 3 pens
3*30=90
and 2 books
2*75=150
10x=y
x=y/10
5*y/10+y=225
y/2+y=225
3y/2=225
3y=225
y=75 now
x=225-y/5
x=225-75/5
x=150/5
x=30
now 3 pens
3*30=90
and 2 books
2*75=150
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1
Total cost of both is rupees 345
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