Question

Q3. If 80 lamps can be lighted 5 hours per day for 10 days for rs.21.24 then the number of lamps which can be lighted 4 hours daily for 30 days for rs.76.50 is

Answer 1

Step-by-step explanation:

Let the required no. of lamps be x.

Less hours per day , more lamps

More money , more lamps

More days, less lamps

Hours per day 4:5 ::80:x

Money 21.25 : 76.5::80:x

No. of days 30:10::80:x

4 × 21.25 × 30 × x = 5 × 76.5 × 10 × 80

x= 306000/ 2550

x=120