Percentage Basics – 1 Key Trick (for Aptitude): Working and Thinking in Relative Quantities - Videos

Mayank Bomb explains the concept of percentage in a simple and lucid manner.

 
Relative Quantities- Fractions, Rations & Percent

Addition & subtraction

 
Key Ideas
1. Fractions, ratios, and percent- relative quantities
2. Relative quantities and absolute quantities are not to be mixed.
3. Relative quantities can be added or subtracted
4. x represents the unknown in the relative quantity.
 
What percent is 60 of 240?
25

 
Find sales tax @ 20% from a gross figure of Rs. 1600?
320
 
If 50% of (x-y) = 30% of (x+y), then what percent of x is y
25%

 
If 10% of a number is added with itself then result becomes 1331. Find the original number.
1210

 
60% of a number is 360. What is 99 % of the same number?
594

 
If 15% of a number is subtracted from itself then result becomes 2550. Find the original number.
3000

If 39 is added in a number, it becomes 113 % of itself. Find the number.
339

 
A house sold for 357000 dollars, produces a profit of 19%, find the profit?
57,000

 
40% of 70 is what % more than 30% of 80?
16.66%

 
A fruit seller had some apples. He sells 40% apples and still has 420 apples. Originally, he had?
700

 
If A = X% of Y and B = Y% of X, then
 
A number exceeds 20% of itself by 40. Find the number?
50

 
A man multiplied a number by 7/4 instead of 3/5. What is % error?
19.16%
 
The total salary of A and B is Rs. 1500. A spent 90% of his income and B spent 80% of his income. The ratio of saving is 3:4. Find the ratio of their salary. What is their absolute salary?
3:2 or 900:600

 
If A exceeds B by 40%, B is less than C by 20%, then A:C is
28:25

Next Class: % Change, Income & Consumption

The price of sugar decreases by 30%. By what % the consumption should increase so that expenditure decreases only by 10%?

A man spends Rs. 5700 from his income of Rs. 8550. If his income and expenditure are increased by 19% and 13%. Find the % change in saving?

This video will be useful for students preparing for entrance exams like JEE, SAT, ACT, GATE, GMAT, GRE.
Also aspirants preparing for examinations like Bank PO, SSC, NTSE, IAS CSAT will find the concepts in this video helpful.

For SSC Postal Course visit – https://www.examrace.com/SSC-CGL/SSC-FlexiPrep-Program/Postal-Courses/Examrace-SSC-CGL-Reasoning-Quantitative-and-English-Series.htm

For GMAT Postal Course visit – https://www.examrace.com/GMAT/GMAT-FlexiPrep-Program/Postal-Courses/Examrace-GMAT-Series.htm

For complete postal course refer http://www.examrace.com/Study-Material/Aptitude/Aptitude-FlexiPrep-Program/Postal-Courses/Examrace-Aptitude-Series.htm or email [email protected]

For lecture handouts google “Average Speed Examrace YouTube Handouts”

source