Page 76 - NUMINO Challenge_A2

3 There is a special promotion at a local supermarket. 3 empty bottles
can be traded in for 1 free bottle of juice. After Ryan bought and drank
9 bottles of juice, he wants to keep trading in empty bottles for more
bottles of juice. What is the greatest number of bottles of juice that
Ryan can get?

Key Point
Keep trading in empty
bottles for new bottles of
juice until you run out of
empty bottles to bring to
the supermarket.

4 There was a certain number of lollipops in two boxes at the start. After
some lollipops are moved in the following steps shown below, each box
contains 20 lollipops. How many lollipops were there in each box at the
start?

Step 1. Find the number of lollipops in box B. Take the same number of lollipops
from Box A and put them into Box B.

Step 2. Find the number of lollipops in box A. Take the same number of lollipops
from Box B and put them into Box A.

Key Point

Box A Box B

Number of The number of
lollipops at lollipops in Box B
is doubled.
the start
The number of
Number of lollipops in Box A
lollipops in is doubled.

Step 1

Number of 20 20
lollipops in
Step 2

73Communication