Your brother is 1/3 your age. your sister is 4 years older than your brother. your sister is 9 years old. write and solve an equation to find your age a.

you are 15

9-4=5

5x3=15

828. all there is to it!

here, if you ever need with rounding (or other forms of arithmetic/math) again, use this:

thats the rounding one, but if you just click the top left, it shows you all the calculators you may need!