Ann bought 5/8 kg of tomatoes to make a salad dish .2/5 of the tomatoes were rotten and the rest were fresh .what was the mass of fresh tomatoes ?

Answer 1

So 3/5 of them were fresh
3/5 * 5/8 = ?

Your questions are almost identical. Look them over carefully
If you take out x/m of something
them 1- x/m = (m-x)/m is left
like
take out 99/100
then
1/100 is left
(100-99)/100 = 1/100