SOLUTION:
Step 1:
In this question, we have the following:
June bought some books for 51 dollars.
This was 3/5 of her money.
How much money did she have to begin with?
Step 2:
From the question,
Let the total money be x, so that:

Simplifying further, we have that:

Cross-multiplying, we have that:


CONCLUSION:
The money she began with = $ 85