Question

In a class girl are 60% of the students and the boys are 18 in number how many students are there in the class

Answer 1

Answer:

30

Step-by-step explanation:

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Answer 2

Answer:

45 students.

First set up a proportion, using an equation.

If 60% of the students in a given class are girls, and there is a known number of boys, 18, then

0.40 * (s) = 18 and 0.6+0.4=1

Now b is the remaining variable; solve the equation by dividing by the quotient, 40%, as represented by 0.40. The number of students, s, is 45. The conclusion is that there are 27 girls in the class.

s - b = g, since b + g = s, g is the variable solved for through subtraction.

Check

27 / 45 simplifies to the expression 3 / 5, or 0.60

Tip

All quotients with an integer in numerator and a 5 in the denominator end in a multiple of 0.20. So 1 / 5 = 0.20, 2 / 5 = 0.40... 4 / 5 = 0.80