The average of five numbers is 34.4. The average of the first and the second number is 46.5. The average of the fourth and the fifth number is 18. What is the third number ?
Average = $$\frac{total sum of elements}{number of elements}$$
Average of 5 numbers = 34.4
total of 5 numbers= 34.4 x 5 = 172
Similarly total sum of 1st and 2nd number = 46.5 x 2 = 93
Similarly total sum of 4th and 5th number = 18 x 2 = 36
3rd Number = 172 - (93+36) = 43
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