If you increase something by 80 percent, your multiplying it by 1.8. This goes the same way for 50 percent. If you multiply 1.8 by 1.5, you will get 2.7. Then convert 2.7 to increasing something by 170 percent. So the answer is 170 percent.
E= Emma's age emma's sister's age= e+9 (emma's age plus 9)
e+9=49 (isolate your variable) e+9-9=49-9 e=40 Emma is 40 years old To check: Emma's sister is 9 years older right? take emmas age 40 plus the nine more years and you still get the total of 49! hope that helps good luck
