1.

The average of 7 numbers is 28. The average of first three of them is 23 and the last three of them is 42. Then the fourth number is:1). 32). 23). 14). 0

Answer»

We know that, AVERAGE = Sum of all quantities/number of quantities

Average of 7 NUMBERS = 28

∴ sum of all numbers = 28 × 7 = 196

Average of first 3 numbers is 23.

Sum of first 3 numbers = 3 × 23 = 69

Average of last 3 numbers os 42.

Sum of last 3 numbers = 3 × 42 = 126

4th number = 196 – 69 – 126 = 1


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