The average of four numbers is 72.Two numbers are 68 and 70.Find the average of other two numbers.
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Let the four number be a, b, c, d
Given a = 68 b= 70
Average of ( a, b, c, d) / 4 = 72
Average ( a, b, c, d) = 72*4
A, b, c, d = 288
68 +70 c, d = 288. (given a and b value)
C + d = 288 - 68 - 70
C + d = 150
( c + d) /2
150 /2
=75
Average = 150,75
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