⁞ Chain Rule
Aptitude ➤ Chain Rule ➤ 1
Question 1
Q1. If 80 lamps can be lighted, 5 hours per day for 10 days for Rs. 21.25, then the number of lamps, which can be lighted 4 hours daily for 30 days, for Rs. 76.50, is :
Answer : 120
Let the required number of lamps be x. Then ,
∴ 4 × 21.25 × 30 × x = 5 × 76.50 × 10 × 80
⇒ x = 120
Hence, the required number of lamps is 120.
⚔ DISCUSS
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