Question

11. A laboratory has to pay 67.50 for 30 days as gas bill if it
uses 35 gas burners for 6 hours a day. Find the amount to be
paid if it uses 30 gas burners for 18 days working 7 hours a day.

(A) Rs. 40-50 (B) Rs. 42-50 (C) Rs. 44.50 (D) Rs. 50-50​

Answer 1

Shortest method of doing this question is:

put in M1×D1×T1W1=M2×D2×T2W2

formula

So,

Let no. of burners→′B′

6b×6hr×8day450=B×10×5625

After solving →B=8

Answer is 8 ✔️✔️