How many red apples were there all together? How many apples were not rotten?

Question

A barrel of apples contained 75 green apples and some red apples. Devon found that 15% of the total number of apples were rotten. Of the rotten apples 2/3 were red and the remaining 6 were green. How many red apples were there altogether? How many apples wee not rotten?

Answer 1

if (2/3) av rotted appels=red & wots left=6 green

that impli (1/3) av rotted=green=6 green & rotted

so total rotted=3*6=18

but 15% av all appels=18, so total appels=18/0.15=120

red=120-75=45