Page 50 - NUMINO Challenge_D2

Problem solving Key Points

1 There are four students, A, B, C, and D, standing Since C can see all
in line. Each of them is wearing one of blue, red, three colors of the
and yellow hats. The students can only see the hats, C is sitting at
hats of the students standing front of them. Find the back.
the color of the hat that D is wearing.

A: I can see a blue hat.
B: A is standing behind me.
C: I can see blue, red, and yellow hats.
D: I can see blue and yellow hats.

2 Sam, Jay, Sue, and Tom each Tom Sam If all three people
wore one of two yellow hats except Sue do not
know the colors of
and three red hats without their hats, it is
because they see
looking. The remaining hat was Jay one yellow hat and
put in a closet. Sue is standing Sue two red hats.

with her eyes closed, while the other three people

can see each other through the hallways as

shown on the right. Read the conversation below

and find the color of Sue’s hat.

Sue: Tom, do you know the color of your hat?
Tom: No, I don’t know.
Sue: Sam, do you know the color of your hat?
Sam: No, I don’t.
Sue: How about you, Jay?
Jay: Um ... I don’t either.
Sue: Oh! I know the color of my hat.

47Reasoning