BPSC – Combined Competitive Examination · প্রশ্ন 87
A 70 kg mixture has sand and cement in the ratio 4:1. How much more sand must be added to make the ratio 6:1?
উত্তর দেখান ও ব্যাখ্যা
উত্তর: (A) 28 kg
ব্যাখ্যা
Cement stays 14 kg; 6:1 needs 84 kg sand; 84 − 56 = 28 kg.
- (A) সঠিক
Correct: sand 56, cement 14; need 84 sand → add 28 kg.
- (B) ভুল
Wrong: too much.
- (C) ভুল
Wrong: too much.
- (D) ভুল
Wrong: too little.
- (E) ভুল
Wrong: only one of the options A–D is correct.