1.

The average of five consecutive even numbers, p, q, r, s and t is 40. What is the product of 'r' and 's' ?

Answer»

1680



Let the numbers be x, x + 2, x + 4, x + 6, and x + 8
Avg = x + x + 2 + x + 4 + x + 6 + x + 8/5 = 40
Therefore, 5x + 20 = 200
Therefore, x = 180/5 = 36
Therefore, r = x + 4 = 40



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