(xiii) Kirti bought some pencil batteries costing ₹ 7.50 each and some torch bulbs costing ₹ 8 each, spending ₹ 137 in all. If the number of bulbs she bought was two-sevenths of the number of batteries, how many of each did Kirti buy?
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Step-by-step explanation:
Step-by-step explanation:
Let no. of pencil batteries bought= x
according to question,
no. of bulbs= 2/7 x
cost of 1 battery = Rs. 7.50
cost of x batteries = Rs. 7.50x
cost of 1 bulb = Rs. 8
cost of 2/7x bulbs = Rs. 16/7x
again according to question,
7.50x + 16/7x = 137
15/2x + 16/7x = 137
255x/14 = 137
x= 137×14
255
x= 7.521
x= 7pencil batteries (approx.)
2/7x=2bulbs
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