Page 164 - NUMINO Challenge_B2
P. 164
Communication 2 Make the sum of the number of students and
teachers equal to 10 and write the number of
trees planted for each condition.
13 Assumptions p.112~p.113
Example 12, 3, 3 Number of Teachers 1 2 3 4 5
Number of Students 9 8 7 6 5
Number of Trees 21 22 23 24 25
Planted
Number of Bicycles 0 1 3 3 4 5 6 3 If you assume that there were 10 teachers, then
10 3 30 trees were planted. But, since 24
Number of Tricycles 6 5 4 3 2 1 0 trees were planted, 30 24 6 trees are
missing. One tree is reduced when a teacher is
Total Number 18 17 16 15 14 13 12 replaced by a student, and since 6 trees were
of Wheels missing, there must be 6 students.
3, 3
Example 2, 20, 20, 6 6, 6, 3 3, 7 Problem solving
TryItAgain If you assume that all of the sea creatures 1 Number of 10 9 8 7
are octopuses, there are 8 8 64 legs. (35 points)
4 legs remain and the number of legs Correct (50 points) (45 points) (40 points)
increases by 2 if one octopus is replaced by Answers
a squid. Therefore, there are 4 2 2
squids. Therefore, there are 2 squids and Number of 10 1 2 3
6 octopuses. Wrong (0 points) ( 4 points)( 8 points)( 12 points)
Answers
Score 100 91 82 73
(50 50) (50 41) (50 32) (50 23)
Type 13-1 Solving Problems in Different Ways p.114~p.115 Therefore, Peter had 8 correct answers and 2
wrong answers.
1 If you assume that each person planted 2 trees,
20 trees are planted altogether. However, 24 2 If you assume that all 10 days are sunny, then
trees are planted; therefore, if you draw 4 more
trees, there must be 4 people who planted 3 Sam gathers 25 10 250 chestnuts. But Sam
trees. Therefore, there were 10 4 6 students. gathers 214 chestnuts, therefore
250 214 36 chestnuts remain. 12 chestnuts
will be reduced when a sunny day is replaced by
a rainy day; therefore, there are 36 12 3 rainy
days and 10 3 7 sunny days.
Answer Key
teachers equal to 10 and write the number of
trees planted for each condition.
13 Assumptions p.112~p.113
Example 12, 3, 3 Number of Teachers 1 2 3 4 5
Number of Students 9 8 7 6 5
Number of Trees 21 22 23 24 25
Planted
Number of Bicycles 0 1 3 3 4 5 6 3 If you assume that there were 10 teachers, then
10 3 30 trees were planted. But, since 24
Number of Tricycles 6 5 4 3 2 1 0 trees were planted, 30 24 6 trees are
missing. One tree is reduced when a teacher is
Total Number 18 17 16 15 14 13 12 replaced by a student, and since 6 trees were
of Wheels missing, there must be 6 students.
3, 3
Example 2, 20, 20, 6 6, 6, 3 3, 7 Problem solving
TryItAgain If you assume that all of the sea creatures 1 Number of 10 9 8 7
are octopuses, there are 8 8 64 legs. (35 points)
4 legs remain and the number of legs Correct (50 points) (45 points) (40 points)
increases by 2 if one octopus is replaced by Answers
a squid. Therefore, there are 4 2 2
squids. Therefore, there are 2 squids and Number of 10 1 2 3
6 octopuses. Wrong (0 points) ( 4 points)( 8 points)( 12 points)
Answers
Score 100 91 82 73
(50 50) (50 41) (50 32) (50 23)
Type 13-1 Solving Problems in Different Ways p.114~p.115 Therefore, Peter had 8 correct answers and 2
wrong answers.
1 If you assume that each person planted 2 trees,
20 trees are planted altogether. However, 24 2 If you assume that all 10 days are sunny, then
trees are planted; therefore, if you draw 4 more
trees, there must be 4 people who planted 3 Sam gathers 25 10 250 chestnuts. But Sam
trees. Therefore, there were 10 4 6 students. gathers 214 chestnuts, therefore
250 214 36 chestnuts remain. 12 chestnuts
will be reduced when a sunny day is replaced by
a rainy day; therefore, there are 36 12 3 rainy
days and 10 3 7 sunny days.
Answer Key
