The graph shows the number of marbles 3 students collected. Study the graph and answer the following.
- Who collected 21 marbles? Give the answer in number. (Eg 1)
- Which 2 students collected a total of 39 marbles? Give the answer in numbers. (Eg 1, 2)
- How many marbles must Molly give to Penny so that both of them would have the same number of marbles?
(a)
3 marbles → 1 triangle
21 marbles → 21 ÷ 3 = 7 triangles
(2) Jem has 7 triangles so she collected 21 marbles.
(b)
Total number of triangles represented by 39 marbles
= 39 ÷ 3
= 13
Number of triangles that Jem and Penny had
= 7 + 6
= 13
2 students who collected a total of 39 marbles are (2) Jem and (3) Penny.
(c)
Difference in the number of triangles that Molly and Penny had
= 8 - 6
= 2
Number of marbles that Molly must give to Penny
= 2 ÷ 2 x 3
= 3
Answer(s): (a) 2; (b) 2, 3; (c) 3