Page 120 - NUMINO Challenge_D2

Problem solving Key Points

1 A 6-L container needs to be filled with water by Find the amount of
turning on a faucet, which pours 70 mL of hot water added to the
water in one minute, and another faucet, which container in one
pours 150 mL of cold water in 3 minutes at the minute.
same time. How many minutes will it take to fill
the container?

2 It takes 30 minutes for a chick to drink all the Let 1 represents the
water in a bowl, and it takes 20 minutes for a
dog to drink the same amount of water. The amount of water filled
chick drank the water in the bowl for
6 minutes and left. Later the dog came and in the bowl. Since the
started to drink the remaining water. How many
minutes did it take the dog to finish the chick drinks
remaining water?
1 of the entire
30

amount of water in 1

minute, the chick

drinks the 6 1
30 5

in 6 minutes.

117Communication