Question 30
The average of five numbers is 26. The average of first two numbers is 30 and that of the last two numbers is 7. What is the third number ?
Solution
Let the numbers be $$A_1 , A_2 , A_3 , A_4 , A_5$$
=> $$A_1 + A_2 + A_3 + A_4 + A_5 = 26 * 5 = 130$$
Also, $$A_1 + A_2 = 30 * 2 = 60$$
and $$A_4 + A_5 = 7 * 2 = 14$$
=> $$A_3 = 130 - 60 - 14 = 56$$
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