5pen and 1 book together cost rs.225.cost of 10 pens is equal to the cost of 1 book find the total cost of 3 pens and 2 books
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5 pen + 1 book =225
10 pens = 1 book
1 pen = x
1 book = y
10 x = y
5x+y=225
5x+10x=225
15x=225
x=15
cost of one pen is 15 rupees
y = 10x
y =10 * 15
y = 150
cost of one book is 150
3 pens is 45
2 books is 300
total = 345
Hope this helps u !!!!!!!!!!!!!!!!!!!!!!!!!!!
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