The total of number of students in the class is 21.
What is Ratio and Proportion ?
A ratio is a non-zero ordered pair of numbers a and b written as a / b. A Proportion is a mathematical expression in which two ratios are specified to be equal.
For every four female students in a training class, there are two men.
This statement gives us the ratio 4: 2
There are seven male students , let the female students be x
x :7
so ,
4:2 = x:7
4/2 =x/7
x = 14
Total number of students = Total number of males + total number of females
= 7 + 14 = 21
the total of number of students in the class is 21.
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