Question
Risa has some balls in a bag. The number of balls is less than 20. If she gives 3 balls to each pupil, she will have none left. If she gives 7 balls to each pupil, she will need 20 more balls.
  1. How many pupils does Risa have?
  2. How many balls are there in the bag?
4 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

Risa has some balls in a bag. The number of balls is less than 20. If she gives 3 balls to each pupil, she will have none left. If she gives 7 balls to each pupil, she will need 20 more balls.
  1. How many pupils does Risa have?
  2. How many balls are there in the bag?