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