Zara has some marbles in a bag. The number of marbles is less than 30. If she gives 4 marbles to each pupil, she will have none left. If she gives 7 marbles to each pupil, she will need 15 more marbles.
- How many pupils does Zara have?
- How many marbles are there in the bag?
(a)
Total extra number of marbles that Zara will need = 15
Number of extra marbles that Zara will give to each pupil
= 7 - 4
= 3
Number of pupils that Zara has
= 15 ÷ 3
= 5
(b)
Number of marbles that Zara has
= 4 x 5
= 20
Answer(s): (a) 5; (b) 20