20 MCQs about Basic Mathematics and Statistics : Important for NRB Officers and Other Competitive Exams
1) A and B can do a piece of work in 72 days, B and C can do it in 120 days, and A and C can do it in 90 days. In what time can A alone do it? a) 150 days b) 120 days c) 100 days d) 80 days 2) The average of 8 numbers is B, and one of the numbers is 14. If 14 is replaced with 28, what is the new average in terms of B? a) B+7/2 b) B+1/2 c) B+2 d) 2B+l 3) Six bells commence tolling together and toll at intervals of 3, 6, 12, 15, 21 and 24 seconds respectively. In 30 minutes, how many times does they toll together? a) 1 b) 2 c) 3 d) 4 4) lf "b" is a positive number, 40% of "b" ...