The number is 49, First do 21 / 3 to find what 1/7 of the number is. We get 7, so we know 1/7 is 7 so if we do 7 x 7 we will have 7/7 or one whole and 7x7 is 49. Hope this helps

You are watching: Three sevenths of a number is 21 find the number

invernessgangshow.net:

The number is 49

Step-by-step explanation:

Let the number be x

From the question,

of x = 21

× x = 21

= 21

Multiply both-side of the equation by 7

× 7 = 21 × 7

(On the left-hand side of the equation, 7 at the numerator will cancel-out 7 at the denominator leaving us with just 3x)

3x = 147

Divide both-side of the equation by 3

=

(On the left-hand side of the equation 3 at the numerator will cancel-out 3 at the denominator, while on the right-hand side of the equation 147 will be divided by 3)

x =

x=49

Therefore the number is 49

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