Explanation

Total trees = Number of rows × Trees in each row

= 243 × 21

= 5103

Explanation

Since the sum doubles itself in 15 years, it will quadruple (2 × 2) in 30 years (15 × 2), and become eight times (2 × 2 × 2) in 45 years (15 × 3).

Explanation

Let Haider's son's present age be x.

Haider's present age = 3x

After 10 years:

Son's age = x + 10

Haider's age = 3x + 10

The sum of their ages after 10 years will be 76:

x + 10 + 3x + 10 = 76

4x + 20 = 76

4x = 56

x = 14

Haider's present age = 3x = 3 × 14 = 42

Explanation

Junaid starts with Rs. 600.

He gives one-fourth (1/4) to Awais:

Amount given to Awais = 600 * (1/4) = Rs. 150

Remaining amount = 600 - 150 = Rs. 450

He then gives half of the remaining amount to Hamza:

Amount given to Hamza = 450 * (1/2) = Rs. 225

Remaining amount = 450 - 225 = Rs. 225

The amount left with Junaid is:

Rs. 225

Explanation

Let's denote the first number as x and the second number as y.

Given equations:

1. 2x + 3y = 61

2. 4x - 5y = 45

We can solve these equations using substitution or elimination. Let's use elimination.

Multiplying equation 1 by 2:

4x + 6y = 122

Now subtracting equation 2 from this:

(4x + 6y) - (4x - 5y) = 122 - 45

11y = 77

y = 7

Explanation

Total population = 6000

In service: 0.05 × 6000 = 300

In trade: 0.4 × 6000 = 2400

Labourers: 0.06 × 6000 = 360

Total employed = 300 + 2400 + 360 = 3060

Jobless = 6000 - 3060 = 2940

Explanation

Given frequencies:

10–20 → 12

20–30 → 18

30–40 → 10

40–50 → 5

50–60 → 2

The minimum frequency is 2, which corresponds to class 50–60.

Explanation

"Father of my brother" refers to Abdul's father.

"Only daughter of the father" refers to Abdul's sister (since Abdul's father has only one daughter).

"He is the son of..." refers to Anwar being the son of Abdul's sister.

Therefore, Abdul is Anwar's:

Maternal Uncle

Explanation

A polygon having 8 sides is called octagon 

A polygon having 10 sides is called decagon

A polygon having 4 sides is called quadrilateral

Explanation

4 boys ran 60km each in 6 hours,10km distance covered by 1 boy in 1 hour