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20% of the total number of pupils in a class is 6.How many pupils are there in the class altogether?
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Solution 1
20% is : = .
So, of the total number of pupils in the class is 6.
Then the total number of pupils in the class is 5 times 6: 5*6 = 30.
Answer. There are 30 pupils in the class.
Solution 2
Let x be the total number of pupils in the class.
Then you are given that = 6.
Cancel the factor 20 in the numerator and the denominator in the left side.
You will get = 6.
Multiply by 5 both sides. You will get x = 5*6 = 30.
The same answer.
On percentage read the lessons in this site
- Percentage problems
- Percentage word problems (Type 1 problems, Finding the Part)
- Percentage word problems (Type 2 problems, Finding the Rate)
- Percentage word problems (Type 3 problems, Finding the Base)
- More complicated percentage problems
in this site.