Question

The average of 5 consecutive odd numbers A, B, C, D and E is 45. What is the product of B and D ?
(a) 2107 (b) 2205 (c) 1935 (d) 2021 (e) None of these

Answer 1

(d) Let the first odd number, A be x.
According to the question
A + B + C + D + E = 5 × 45
⇒x + x +2 +x + 4 + x +6 + x + 8 = 225
⇒5x + 20 = 225
⇒5x = 225 - 20 = 205