200 bulbs are used 4 hours per day and expenditure of 6 days is Rs. 40. Then how many bulbs should be used 3 hours per day so that expenditure of 15 days is Rs. 48 ?

200 bulbs are used 4 hours per day and expenditure of 6 days is Rs. 40

1.	200 bulbs are used 4 hours per day and expenditure of 6 days is Rs. 40. Then how many bulbs should be used 3 hours per day so that expenditure of 15 days is Rs. 48 ?
A.	72
B.	800
C.	128
D.	90
Answer» D. 90

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200 bulbs are used 4 hours per day and expenditure of 6 days is Rs. 40. Then how many bulbs should be used 3 hours per day so that expenditure of 15 days is Rs. 48 ?

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