Ques 1 Percentage
A is 150% of B and B is 40% of C. If A+B+C=20, then the value of 2B+3C – 4A is equal to
Given that A is 150% of B, so A = 150/100 * B = 3B/2
Given that B is 40% of C, so B = 40/100 * C = 2C/5
Also given that A + B + C = 20
Substituting the values of A and B in terms of C, we get
3C/2 + 2C/5 + C = 20
10C/10 = 20
C = 2
So, B = 4 and A = 6
Therefore, 2B + 3C - 4A = 2 * 4 + 3 * 2 - 4 * 6 = 8 + 6 - 24 = 14.
Hence, the correct answer is option (d).
Ques 2 Percentage
Two numbers are less than a third number by 37% and 30%, respectively. By what percentage is the second number more than the first?
Ques 3 Percentage
Gaurav earns 800 per day. After some weeks, he earns 960 per day. What is the percentage increase in his daily earnings?
The original earnings is 800, and the new earnings is 960. The difference is 960 - 800 = 160.
The percentage increase=(Increase / Original) * 100%
The percentage increase=(160 / 800) * 100% = 20%
Ques 4 Percentage
The average percentage of girls in class X examination in a school is 85% and that of boys is 83%. The average pass percentage of all boys and girls in class X of that school is 83.7% Find the percentage of the number of girls in class X of that school.?
Given:
The average pass percentage of girls = 85%
The average pass percentage of boys = 83%
The overall average pass percentage = 83.7%
We can set up the following equation based on the weighted average formula:
85 × x + 83 × (100 - x) = 83.7 × 100
85x+8300−83x=8370
2x=70
x=35
So, the percentage of girls in class X is 35%.
Answer: (c) 35%
Ques 5 Percentage
A person saves 25% of his income. If his income increases by 20% and his saving remains the same, then what will be the increased percentage of his expenditure?
Ques 6 Percentage
A, B and C are three positive numbers such that A is 70% of B, and B is 40% of C. If the sum of all three numbers is 336, then 15% of the sum of B and C is
Ques 7 Percentage
Renu spends 68% of her income. When her income increases by 40%, she increases her expenditure by 30%. Her savings are increased by
Ques 8 Percentage
There are 450 students in a school and there are two sections A & B in the school. There are three streams
in each section i.e., Art, Science & Commerce. (75/4)% of total students in A are in Commerce and (200/7)% of total students in B are in Science. Sum of total students in Commerce in A & total students in Science in B is 105. (400/21)% of total students in B are in Commerce and 50% of total students in A are in Art.
Total students in Art in A is what percent more than total students in Science in B?