number of girls is 60% of the total students who are going for a picnic the number of girls for picnic is only 24. so what is number of the boys?
Answers
Answer:
Step-by-step explanation:
The picnic site is 55 kilometre from the school and the transport company is charging the rate Rupees 12 per kilometre. The total cost of the refreshment will be rupees 4280.
can you tell.
1. The ratio of the number of girls to the number of boys in the class.
2. The cost per head if two teachers are also going with the class?
3. If their first stop is at a place 22 km from the school; what percent of the total distance of 55 kilometre is this? What percent of the distance is left to be covered?
Answer:
Boy's = 12
Step-by-step explanation:
Given percentage of girls in total in the question as:
60%
of total are girls.
Given the value of above percentage is equal to as: 18
Let us assume the total number of students as x
:
x= total number of students.
So, by first 2 conditions, we get an equation as:
60%
of x=18........(i)
We need a value of 60% of x to solve this.
By definition of percentage, we can say value of percentage is:
60%
of x=60×x100
By cancelling numerator and denominator by 10, we get:
60%
of x=6×x10
By cancelling the right hand-side, by 2, we get it as:
60%
of x=3x5
By substituting this in the equation (i), we get it as:
3x5=18
By multiplying 5 on both the sides, we get it as:
3x5×5=18×5
By simplifying the above equation, we can write it as:
3x=18×5
By simplifying the right hand-side of equation:
3x=90
By dividing with 3 on both sides, we get it as:
3x3=903
By simplifying the above equation, we get it as:
x=30.........(ii)
We know that total is formed by boys, girls. So, total number of students = number of boys + number of girls. For equation (ii) and value of girls given, we get it as:
30=number of boys+18
Number of boys =30−18
On simplification, we get
Number of boys =12