Page 166 - NUMINO Challenge_C2

15 Clever Solutions p.128~p.129 Problem solving

Example Ben 1 When one drop of the is dropped, the area it

TryItAgain You can get 3 free bottles of soda in covers will be 1, 2, 4, and 8 and when two drops
exchange for 12 empty bottles. Also, with are dropped, the area will be 2, 4, and 8.
the remaining empty bottle of soda from Therefore, it will take 3 seconds to cover an area
the 13 bottles, and the 3 bottles you get of 8.
later, you can get I more bottle.
13 3 1 17 bottles of soda. 2 The distance between the spacecraft and the

Earth doubles every day. Therefore, the
spacecraft will reach planet Beta on December
30th.

Example 30 20 20

TryItAgain When two people eat two apples in two Type 15-2 Cooking Pancakes p.132~p.133
minutes, it is the same as one person eating
one apple. Therefore, when eight people 1 Frying Front Back Front Back 4 minutes
eat eight apples, it is the same as one
person eating one apple. Therefore, it will Pan Front Back
take 2 minutes.
1111
Minute Minute Minute Minute

Type 15-1 Multiplying Mushrooms p.130~p.131 2 You will need to cook one pancake at the end;
therefore, there will be one spot left on the
1 Today After 2 days After 3 days After 4 days After 5 days frying pan.

1 2 4 8 16 3 Frying Pan

Today After 2 days After 3 days After 4 days After 5 days 1 Minute Front
2 4 8 16 32 Front

2 1 day 1 Minute Front
Back
3 19 days
1 Minute Back
4 If the cave is filled today, then the cave was half Back
filled the previous day, and a quarter filled two
days before. Therefore, the cave will be filled 4 3 minutes
after 19 days.

Answer Key