BPSC – Combined Competitive Examination · প্রশ্ন 83
Anil and Suman together can finish a job in 12 days, which Anil alone can do in 20 days. How long will Suman take alone?
উত্তর দেখান ও ব্যাখ্যা
উত্তর: (C) 30 days
ব্যাখ্যা
Combined rate 1/12 minus Anil's 1/20 leaves Suman's rate 1/30.
- (A) ভুল
Wrong: 1/12 − 1/20 = 1/30, not 1/28.
- (B) ভুল
Wrong: incorrect.
- (C) সঠিক
Correct: Suman's rate = 1/12 − 1/20 = 1/30, so 30 days.
- (D) ভুল
Wrong: incorrect.
- (E) ভুল
Wrong: only one of the options A–D is correct.