Consecutive Multiples

Fast trick to find consecutive multiples

Q .A, B, C, D are four consecutive odd integers and their average is 8.What is the product of B and D.

As we know the four consicutive numbers are -

5 , 7 , 8 , 9 , 11

Where A = 5
B = 7
C = 9
D = 11

So the product of B and D is -

7 * 11 = 77