Level 3
40 children in a class sold an average of 19 artworks for charity. There were 8 more boys than girls in the class. The average number of artworks sold by the boys was 15. Find the average number of artworks sold by the girls.

Level 3
The average number of cards Jeryl and Ronnie had was 105. The average number of cards Jeryl and Daryl was 67.5. Given that the ratio of the number of cards Ronnie had to the number of cards Daryl had was 5 : 2, find the number of cards Jeryl had.

Level 3
Sam, Martin, Aden and Ron participated in a Chinese quiz. The average number of points scored by Sam and Martin was 77. The average number of points scored by Martin and Ron was 71.5. The average number of points scored by Sam, Martin and Ron was 73. The average number of points scored by Aden and Ron was 69. How many points did each of them score?

1. Ron?
2. Sam?
3. Martin?
4. Aden?

Level 3
The average number of questions Daniel and Callie solved was 203. The average number of questions Callie and Evelyn solved was 194. The average number of questions Evelyn and Daniel solved was 181. How many questions did each of them solve?

1. Callie?
2. Daniel?
3. Evelyn?

Level 3
Class A, B and C were given some chocolate bars to sell for their fundraising event. The average number of chocolate bars the 3 classes had at first was 225. After Class B sold twice as many chocolate bars as Class A and Class C sold ³₄ as many chocolate bars as Class B, the average number of chocolate bars the 3 classes had left was 45. How many chocolate bars did Class A and Class C sell altogether?