Xuan has some marbles in a bag. The number of marbles is less than 30. If she gives 5 marbles to each pupil, she will have none left. If she gives 10 marbles to each pupil, she will need 20 more marbles.
- How many pupils does Xuan have?
- How many marbles are there in the bag?
(a)
Total extra number of marbles that Xuan will need = 20
Number of extra marbles that Xuan will give to each pupil
= 10 - 5
= 5
Number of pupils that Xuan has
= 20 ÷ 5
= 4
(b)
Number of marbles that Xuan has
= 5 x 4
= 20
Answer(s): (a) 4; (b) 20