Question

write equation and solve them ifone third of a number is increased by 7 the sum will be 21​

Answer 1

Answer:

The number is $\frac{21}{20}$.

Step-by-step explanation:

Let the number be x.

The expression is:

$\frac{1}{3}x+7=21$

Solve the above equation for x as follows:

$\frac{1}{3}x+7=21\\x+21=21x\\20x=21\\x=\frac{21}{20}$

Thus, the number is $\frac{21}{20}$.

Answer 2

Answer:

$\red { Required \: number } \green {= 42 }$

Step-by-step explanation:

$Let \: the \: number = x$

$One \: third \: of \: the \: number = \frac{x}{3}$

/* According to the problem given,

$\frac{x}{3} + 7 = 21$

$\implies \frac{x}{3} = 21 - 7$

$\implies \frac{x}{3} = 14$

$\implies x = 14 \times 3 = 42$

Therefore.,

$\red { Required \: number } \green {= 42 }$

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