Tiffany has some marbles in a bag. The number of marbles is less than 30. If she gives 7 marbles to each pupil, she will have none left. If she gives 10 marbles to each pupil, she will need 12 more marbles.
- How many pupils does Tiffany have?
- How many marbles are there in the bag?
(a)
Total extra number of marbles that Tiffany will need = 12
Number of extra marbles that Tiffany will give to each pupil
= 10 - 7
= 3
Number of pupils that Tiffany has
= 12 ÷ 3
= 4
(b)
Number of marbles that Tiffany has
= 7 x 4
= 28
Answer(s): (a) 4; (b) 28