Question

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

Answer 1

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

Answer 2

Total cost of both is rupees 345