Question

Notes
The areeage of 4 numbers is 7 If
the sum
of first three numbers
is 20. Find the fourth number:​

Answer 1

Answer:

Here,

T4 = Fourth number

S4 = Sum of 4 numbers

S3 = Sum of 3 numbers

Step-by-step explanation:

$Average = \frac{Sum}{No \: \: of \: \: Terms} \\ 7 = \frac{Sum}{4} \\ 7 \times 4 = Sum \\ \underline{ \underline{ 28}} = Sum \\ \\ T_{4} = S_{4} - S_{3} \\ T_{4} = 28 - 20 \\ T_{4} = \underline{ \underline{8}}$

Answer 2

8

Step-by-step explanation:

Average of 4 numbers = 7

Sum of 4 numbers = 4×7 = 28

Sum of first 3 numbers = 20

Hence, fourth number = 28-20 = 8 Ans..

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