Question 981839
y, my age
x, my sister's age


<i>My current age is 4 times what my sister's age was 20 years ago. </i>

{{{y=4(x-20)}}}


<i>I am now twice as old as I was 20 years ago. </i>

{{{highlight_green(y=2(y-20))}}}


<i>Ten years ago, my sister's age was 1/2 of my current age. </i>

{{{x-10=(1/2)y}}}


<i>Ten years ago, my age was 1.5 times my sister's age.</i>

{{{y-10=(1.5)(x-10)}}}



A few simple sentences forming a complicated description, but you should find that the
question to be answered will come from just one equation in the single variable, y.