Last week’s answer: 5. 80% of 25 = 20, so there are 20 red tomatoes. Therefore there must be 25 – 20 = 5 yellow tomatoes.
This week’s problem: Adam is 9, Bernard is 12 and Charlotte is 15. Mary joins them, and the average age of the group goes up by two years. How old is Diane?
The answer will be in next week’s weekly problem.