Level 3
Olivia is 20% heavier than Xavier. Dana is 40% lighter than Xavier. Olivia is 12 kg heavier than Dana. What is Xavier's mass?

Level 3
Clifford had 80% fewer sweets than Ashwin. After Ashwin gave 210 sweets to Clifford, Clifford had ²₃ as many sweets as Ashwin. How many sweets did each of them have in the end?

1. Ashwin
2. Clifford

Level 3
Jeanne's school organized a trip to Japan. At first, the ratio of the number of boys to the number of girls who planned to participate in the trip was 7 : 5. On the day of registration, 52 girls decided to withdraw and 52 more boys decided to join in. In the end, the number of girls who participated became 20% of the total participants for the trip. How many more boys than girls would visit Japan in the end?

Level 3
Benny and Nigel both received an allowance from their father. Benny initially received 30% of the money. He then gave Nigel $5, and was left with ¹₃ as much money as Nigel. What was the total amount of money given to the two boys?

Level 3
Adam has 200 red stickers, blue stickers and green stickers.
40% of the stickers are blue.
30% of the remaining stickers are red.
The rest are green stickers.

1. How many green stickers are there?
2. How many less red stickers than blue stickers?