Question

find the value of x​

Answer 1

Solution to your question:-

$\frac{21 + 25 + 26 + x + 31 + 32 + 33}{7} = 28 \\ \frac{168 + x}{7} = 28 \\ 168 + x = 196 \\ \\ therefore - \\ x = 28$

Hope this would help you......

Answer 2

HØLÁ ...❤

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$\text{Average} = \dfrac{ \text{sum \: of \: numbers}}{ \text{number \: of \: terms}}$

Sum of numbers = 21 + 25 + 26 + x + 31 + 32 + 33

Sum of numbers = 168

Number of terms = 7

$\sf{average = \dfrac{sum \: of \: numbers}{number \: of \: terms}} \\ \\ \implies \sf 28 = \frac{168 + x}{7} \\ \\ \implies \sf 168 + x = 28 \times 7 \\ \\ \implies \sf 168 + x = 196 \\ \\ \implies \sf x = 196 - 168 \\ \\ \underline{\red{\bf x = 28}}$

Hence, x = 28 is answer.