KatTheMuffin KatTheMuffin

14-08-2017
Mathematics

contestada

Seven times the difference of 9 and a number amounts to 84. Find the number.

Respuesta :

koziadam koziadam

14-08-2017

7 * (n-9) = 84
7n - 63 = 84
7n = 147
/n /n
n = 21

Therefore the number is 21.

Proof:

7 * (21-9) = 84
7 * 12 = 84
84 = 84

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