Let x be the unknown number. One fifth of this number is x/5, one fourth of this number is x/4. So, we have
We know that this difference equals 9, so we have
Multiply both sides by 20 to get
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Let x be the unknown number. One fifth of this number is x/5, one fourth of this number is x/4. So, we have
We know that this difference equals 9, so we have
Multiply both sides by 20 to get