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
 
chain rule

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