Olivia has some marbles in a bag. The number of marbles is less than 20. If she gives 4 marbles to each pupil, she will have none left. If she gives 7 marbles to each pupil, she will need 12 more marbles.
- How many pupils does Olivia have?
- How many marbles are there in the bag?
(a)
Total extra number of marbles that Olivia will need = 12
Number of extra marbles that Olivia will give to each pupil
= 7 - 4
= 3
Number of pupils that Olivia has
= 12 ÷ 3
= 4
(b)
Number of marbles that Olivia has
= 4 x 4
= 16
Answer(s): (a) 4; (b) 16