math problem I cannot do =(?
nine men and two boys want to cross a river, using an inflatable raft that will carry either one man or the two boys. How many times must the boat cross the river in order to accomplish the goal? (a round trip equals two crossings).
First, I’m going to assign each boy a letter (A, B).
1
A & B
2
A
3
Man 1
4
B
5
A & B
6
A
7
Man 2
8
B
9
A & B
10
A
11
Man 3
12
B
13
A & B
14
A
15
Man 4
16
B
17
A & B
18
A
19
Man 5
20
B
21
A & B
22
A
23
Man 6
24
B
25
A & B
26
A
27
Man 7
28
B
29
A & B
30
A
31
Man 8
32
B
33
A & B
34
A
35
Man 9
36
B
37
A & B
So, it would take 37 crossing to get all 9 men and both boys across.
A September Weekend in Montreal – River surfing, rope swinging, river rafting, trampoline
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