Page 149 - NUMINO Challenge_D2
P. 149
Answer
Key
Problem solving 3 According to Joe, who is standing in front of
Ryan, the three students who are standing in
1 Each member of the family should travel as front of Joe can be wearing two yellow hats and
one red hat, or one yellow hat and two red hats.
shown below. But Ryan said that he knows the color of his hat,
therefore the four students in front of him should
Car Gas Station be wearing two yellow hats and two red hats.
Son, Daughter(81kg) Three blue hats are remaining, therefore Ryan is
wearing a blue hat.
Dad, Mom
Problem solving
Dad, Mom Son Daughter
1 C can see all three hats, therefore C is standing
Dad Son, Mom(89kg) Daughter
at the far back. D can see two hats, therefore D
Dad daughter Mom, Son is standing on the second row from the back. A
is standing right behind B, therefore the order
Daughter Dad Mom, Son that the four students are standing in is, from
the front, B A D C. Since A said that he can
Daughter Son Dad, Mom see a blue hat, then B is wearing a blue hat.
Since D said he can see blue and yellow hats,
Son, Daughter(81kg) Dad, Mom therefore A is wearing a yellow hat. Therefore,
since C said that he can see all three hats, D is
Therefore, they should move at least 7 times. wearing a red hat.
2 Since the explorer can walk 1 km a day, and the 2 To make the three children besides Sue, not
distance from the 2-km point to the 7-km point is knowing the color of their hats, the hats that can
5 km, he should leave with five bottles of water at be seen should be a yellow hat and two red
the 2-km point. Therefore, if he uses the method hats. The person that the three children are
shown below, he can cross the desert in 13 days. looking at the same time is Sue, and the colors
of their hats are unknown Therefore Sue's hat
0km 1km 2km 3km 4km 5km 6km 7km should be yellow.
Remain 1 Bottle
Return
Remain 1 Bottle
Return
Take 5 Take the Take the4 Bottles 3 Bottles 2 Bottles 1 Bottle 0 Bottle
Bottles Remaining Remaining
1 Bottle. 1 Bottle.
511 511
5(Bottles) 5(Bottles)
Type 5-2 Color of the Hat p.46~p.47
1 Thomas knows the color of Anna's hat, therefore
Anna's hat is yellow.
2 Joe said that he can see yellow and red hats.
Therefore, Anna, Thomas, and Sarah who are
standing in front of Joe cannot be wearing blue
hats.
NUMINO Challenge D2
Key
Problem solving 3 According to Joe, who is standing in front of
Ryan, the three students who are standing in
1 Each member of the family should travel as front of Joe can be wearing two yellow hats and
one red hat, or one yellow hat and two red hats.
shown below. But Ryan said that he knows the color of his hat,
therefore the four students in front of him should
Car Gas Station be wearing two yellow hats and two red hats.
Son, Daughter(81kg) Three blue hats are remaining, therefore Ryan is
wearing a blue hat.
Dad, Mom
Problem solving
Dad, Mom Son Daughter
1 C can see all three hats, therefore C is standing
Dad Son, Mom(89kg) Daughter
at the far back. D can see two hats, therefore D
Dad daughter Mom, Son is standing on the second row from the back. A
is standing right behind B, therefore the order
Daughter Dad Mom, Son that the four students are standing in is, from
the front, B A D C. Since A said that he can
Daughter Son Dad, Mom see a blue hat, then B is wearing a blue hat.
Since D said he can see blue and yellow hats,
Son, Daughter(81kg) Dad, Mom therefore A is wearing a yellow hat. Therefore,
since C said that he can see all three hats, D is
Therefore, they should move at least 7 times. wearing a red hat.
2 Since the explorer can walk 1 km a day, and the 2 To make the three children besides Sue, not
distance from the 2-km point to the 7-km point is knowing the color of their hats, the hats that can
5 km, he should leave with five bottles of water at be seen should be a yellow hat and two red
the 2-km point. Therefore, if he uses the method hats. The person that the three children are
shown below, he can cross the desert in 13 days. looking at the same time is Sue, and the colors
of their hats are unknown Therefore Sue's hat
0km 1km 2km 3km 4km 5km 6km 7km should be yellow.
Remain 1 Bottle
Return
Remain 1 Bottle
Return
Take 5 Take the Take the4 Bottles 3 Bottles 2 Bottles 1 Bottle 0 Bottle
Bottles Remaining Remaining
1 Bottle. 1 Bottle.
511 511
5(Bottles) 5(Bottles)
Type 5-2 Color of the Hat p.46~p.47
1 Thomas knows the color of Anna's hat, therefore
Anna's hat is yellow.
2 Joe said that he can see yellow and red hats.
Therefore, Anna, Thomas, and Sarah who are
standing in front of Joe cannot be wearing blue
hats.
NUMINO Challenge D2
