1 Answer

Hassan Khallouf · Answer 1 · 2016-11-06T15:37:03+0000

Let's work backwards.
First, subtract 68 from 72.
72-68=4
Now, this is the quotient of the unknown number and 54.
Multiply the quotient by 54.
54×4=216
And check.
216÷54=4
4+68=72
The unknown number is 216

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