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1 mark

The average of 48, 39 and y is 40. Find the value of y.

  1. A
    33
  2. B
    32
  3. C
    35
  4. D
    31

Solution & Step-by-step Explanation

The formula for the average of three observations is:
Average=
Total number of observations
Sum of all observations
​

Given that the average of 48, 39, and y is 40:

3
48+39+y
​
=40
Multiply both sides by 3:

48+39+y=120
87+y=120
y=120−87=33

Practice this question

Try it yourself before checking the explanation above.

The average of 48, 39 and y is 40. Find the value of y.
A
33
B
32
C
35
D
31

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