answer:
if you rounded it the answer is 15 years old!
step-by-step explanation:
when know that your sister is 9 years old, so lets start off with that. because your sister is 4 older then your brother then that must mean that you brother is 5 years old
9-4
= 5
we also know that you brother is 1/3 your age so divide 5 by 1/3 or .33
5/ .33
= 15.15
but since it looks like we only need the whole number. just round down to 15 since your age is not close enough to round up to 16
( here is a tip i have gotten for rounding )
1-4 stay on the floor
5-9 climb the vine
haha they might sound super du-mb but they have helped me when i was younger!
hope this helps you and if you ever need anymore help/questions just ask me! :)
