Question

the average of 5 numbers is 40 if four of these numbers are 26,64,38,20 find the remaining number

please understand full maths​

Answer 1

Let the number be x–
(26 + 64 + 38 + 20 + x) / 5 = 40
148 + x = 200
x = 200 – 148
x = 52


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