06 Apr, 2010
Hamsters
Ref : P3 Lesson 12
These are only 3 cages and some hamsters at Cutie Pet Shop as shown below. At Cutie Pet Shop, there is a rule that there can only be a maximum of 5 hamsters in a cage. The owner of the pet house had ordered another 35 hamsters and they will arrive next week. What is the least number of cages the owner needs to buy to keep all the hamsters in Cutie Pet house?
>>Solution
In Pet house : 6 hamsters (as shown in picture)
Additional: 35 hamsters
Total hamsters : 6 + 35 = 41 hamsters
1 cage = max 5 hamsters
41 รท 5 = 8 R1
Here ‘8’ means there will be 8 cages with 5 hamsters in each cage
Remainder ‘1’ means there will be one hamster ‘left’
We can’t leave this hamster running around the pet house, can we? We need to put this ONE hamster into ONE cage.
Total: we need 8 + 1 = 9 cages to keep all 41 hamsters.
There are already 3 cages in the pet shop.
So the owner needs to buy 9 - 3 = 6 cages more
Answer : 6 cages
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