Level 3
Linda and Melody's total mass is 51 kg. Melody and Nicole's total mass is 81 kg. Nicole is three times as heavy as Linda. What is the average mass of the three friends?

Level 3
Ken has 30% more stamps than Vincent. Tim has 80% the number of stamps Ken has.

1. What is the ratio of the number of Vincent's stamps to the number of Tim's stamps?
2. If the total number of stamps of Ken's and Tim's is 150 more than Vincent's, how many stamps does Ken have?

Level 3
There were some cars, vans and buses. ²₃ of the total vehicles were cars and vans. There were 16 buses and thrice as many cars as vans. How many more cars than vans were there?

Level 3
During a telematch, each group of students was supposed to collect as many coloured candies as possible. Each colour represented a certain point as tabulated:

Yellow 3 points
Pink 6 points
Blue 7 points

In each container, the number of yellow candies was 20% more than the number of blue candies and 10% less than the number of pink candies. Given that the total possible points if the group managed to collect all the candies were 558 points, how many candies were not yellow in colour?

Level 3
25% of the people are performers for a concert and the rest are spectators. 60% of the spectators are adults and there are 420 less child spectators than adult spectators. How many adult spectators must join so that 56% of the people are adult spectators?