Question

the average of four number is 72. two of numbers are 68 and 70. find the average of other two number​

Answer 1

Let the four numbers be w, x, y, z

Given: w = 68, x = 70

Average of w, x, y, z = (w + x + y + z)/4

(w + x + y + z)/4 = 72

w + x + y + z = 72 x 4 = 288

68 + 70 + y + z = 288

y + z = 288 - 70 - 68

y + z = 150

(y + z)/2 = 75 ——> Answer

Answer 2

The average of other two number is 75

Given :

• The average of four number is 72.
• Two of numbers are 68 and 70

To find :

The average of other two number

Solution :

Step 1 of 4 :

Find sum of four numbers

Here it is given that the average of four number is 72

So the sum of four number

= 72 × 4

= 288

Step 2 of 4 :

Find sum of two of four numbers

Two of four numbers are 68 and 70

Sum of two of four numbers

= 68 + 70

= 138

Step 3 of 4 :

Find sum of other two number

Sum of other two number

= 288 - 138

= 150

Step 4 of 4 :

Find the average of other two number

Hence average of other two number

$\displaystyle \sf{ = \frac{150}{2} }$

$\sf = 75$

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