Question 1167798
Ella started with a certain amount of money. She spent 2/5 of her money. She
earned Php5.00 the next day. Later she lost 3/7 of her money, but she still has
Php20.00 left. How much did she have at first?<pre>
Solve it backwards.

Begin with the Php20.00 she had left.

Going back a step,
</pre>Later she lost 3/7 of her money,...<pre>
So Php20.00 was 4/7 of what she had before she lost 3/7 of her money, so we
divide Php20.00 by 4/7. {{{20.00^""/(4/7)=20.00*expr(7/4)=35.00}}}

So she had Php35.00 before she lost 3/7 of it.

Going back another step:
</pre>She earned Php5.00 the next day.<pre>
So before she earned Php5.00, she only had Php30.00

Going back another step:
</pre>She spent 2/5 of her money.<pre>
So the Php30.00 was only 3/5 of the money she had before she spent 2/5 of it.

so we divide Php30.00 by 3/5. {{{30.00^""/(3/5)=30.00*expr(5/3)=50.00}}}

So she started with Php50.00.

Edwin</pre>