Question 1186457
.
A boy has twice as much money as his sister. If he gives P10 to his sister, they would have the sake amount. 
How much money did each have?
~~~~~~~~~~~~


<pre>

x = sister.

2x = boy.


After giving P10 to the sister


    2x - 10 = x + 10


Simplify and solve


    2x - x = 10 + 10

       x   =    20


<U>ANSWER</U>.  Sister has P20;  boy has twice as much, i.e.  P40.


<U>CHECK</U>.   After giving  40 - 10 = 30 = 20 + 10.    ! Correct !
</pre>

Solved.