# Math on graphs

posted by on .

If 30 3rd graders owned birds, how many third graders were surveyed?

Reptiles 5%
Birds 5%
Fish 10%
Cats 35%
Dogs 45%

I did 5% of 30 = .05 x 30 = 1.5

BUT I am thinking I am doing something wrong? Where did I go wrong?
Should it be 30/.05 = 600 students were surveyed?

I want to understand my steps on where I messed up? Could you show me?

• Math on graphs - ,

If you have 20 third graders, how can 30 of them have birds ????

Do you know algebra? then ...

let the number of students be x
.05x = 30
x = 30/.05= 600

If you don't know algebra ...

5% of the students = 30
so 1% of the students = 6 , (divide by 5)
then 100% = 6(100) =600
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