# Percentage (Aptitude) YouTube Lecture Handouts for Competitive Exams

Watch Video Lecture on YouTube: Percentage Basics - 1 Key Trick (For Aptitude): Working and Thinking in Relative Quantities

Percentage Basics - 1 Key Trick (For Aptitude): Working and Thinking in Relative Quantities Image of Fractions Decimals and Percentages Image of Fractions Decimals And Percentages

## Relative Quantities- Fractions, Rations & Percent Image of Relative Quantities,Fractions,Rations and Percent Image of Relative Quantities,Fractions,Rations And Percent

## Key Ideas

• Fractions, Rations and percent- relative quantities

• Relative quantities and absolute quantities are not to be mixed.

• Relative quantities can be added or subtracted

• x represents the unknown in the relative quantity.

25

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

594

## If 15% of a Number is Subtracted from Itself then Result Becomes 2550. Find the Original Number

3000 Image of Mental Math for Percents Basics Image of Mental Math For Percents Basics

339

57,000

16.66%

700

1. X > Y

2. A > B

3. Y < X

4. A = B

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

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?

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