Rebecca's annual income is $15, and Jimmy's annual income is $18. By how much must Rebecca's annual income increase so that it constitutes 50% of Rebecca and Jimmy's combined income? Pick one.
A) 7 B) 8 C) 9 D) 3 E) 10
total rebecca = x+15; total = x+20+18   x+15/x+33 = 50/100 therefore x =3   3
<result>D</result>
Rebecca's annual income is $15, and Jimmy's annual income is $18. By how much must Rebecca's annual income increase so that it constitutes 50% of Rebecca and Jimmy's combined income?