Chain Rule - Quantitative Aptitude (MCQ) questions for Q. 28623

Q.  A tank has oxygen for 72 patients and can last for 54 hours for them. If patients reduce their oxygen consumption by 10%, then 90 patients can use this oxygen supply for how many hours?
- Published on 17 Mar 17

a. 24 hours
b. 48 hours
c. 36 hours
d. 42 hours

ANSWER: 48 hours
 
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    Discussion

  • Manoj Kumar Kandhavel   -Posted on 19 Jul 20
    But sir you said we have to interchange the work - so From the question we are able to know and I assumed W1 = 1 and W2 = 0.9(10% less consumption).
    So from the formula ,
    M1*T1*W2 = M2*T2*W1
    72 * 54 * 0.9 = 90 * T2 * 1
    T2 = 38.88 hours

    But you said 48 hours.what is the logic here sir ? Kindly respond

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