Explanation

18 carat gold means 18 parts out of 24 parts are pure gold.

Percentage of pure gold = (18/24) × 100 = 75%

Explanation

Let the numbers be 5x and 4x.

Given:

5x - 4x = 8

x = 8

Numbers are:

5x = 5(8) = 40

4x = 4(8) = 32

Explanation

Let's assume the son's age is x.

Man's age = 3x

Ten years ago:

Son's age = x - 10

Man's age = 3x - 10

Given:

3x - 10 = 5(x - 10)

3x - 10 = 5x - 50

40 = 2x

x = 20

Explanation

Largest even 3-digit number = 998

Smallest even 3-digit number = 100

Difference = 998 - 100 = 898

Explanation

Total weight of empty drums = 1749 × 2 = 3498 kg

Total weight of wheat = 8032 - 3498 = 4534 kg

Explanation

Let x be the total number of pages.

x - 4/5x = 50

1/5x = 50

x = 50 × 5

x = 250

Explanation

3/5 = 6/x

3x = 5 × 6

x = 30/3

x = 10

Explanation

A proper fraction is a fraction where the numerator is less than the denominator.

So 1/5 is right answer.

Explanation

1 meter = 100 cm

10 cm = 10/100 = 1/10 meter

Explanation

20% of 30 = 0.2 × 30 = 6

25% of 60 = 0.25 × 60 = 15

Calculation

6 + 15 = 21