Kezia used of her money to buy some pens and of the remainder to buy 3 files

MATHEMATICS · Subjective · CBSE · Mathematics · Proportional Reasoning · Proportional Reasoning

Problem

Kezia used

\frac{5}{12}

of her money to buy some pens and

\frac{6}{7}

of the remainder to buy 3 files. A file costs 4 times as much as a pen. How many pens did she buy?