Explanation

Meena's problem-solving rate per minute:
24 problems ÷ 15 minutes = 1.6 problems per minute

In 40 minutes:
1.6 × 40 = 64 problems.

Explanation

Let the initial population in 1950 be 100.
Since the population doubles every 10 years, the population growth is as follows:

• 1960 → 100 × 2 = 200
• 1970 → 200 × 2 = 400
• 1980 → 400 × 2 = 800

Total increase in population = 800 - 100 = 700
Percentage increase = (700 / 100) × 100 = 700%.

Explanation

Let the total number of pencils be x.

• Pencils given to Afzal = 110
• Pencils given to Amjad = 75
• Remaining pencils = 315

So,
x - (110 + 75) = 315
x - 185 = 315
x = 500

Now, percentage of pencils given away:
(185 / 500) × 100 = 37%

Explanation

• 20% of x given to Urooj → 0.2x
• 15% of x given to Mehwish → 0.15x
• Remaining candies = 520

So,
x - (0.2x + 0.15x) = 520
x - 0.35x = 520
0.65x = 520
x = 520 ÷ 0.65 = 800

Explanation

To find the total number of packages:

Total weight of meat = 100 kg

Weight of each package = 4/7 kg

Number of packages = Total weight / Weight per package

= 100 / (4/7)

= 100 * 7 / 4

= 175

Explanation

Given:

Zˣ = 32

Since 32 is a power of 2:

32 = 2⁵

So, Zˣ = 2⁵

Now, equate the exponents:

X = 5

Now, find X²:

X² = 5² = 25

Explanation

652(523) + 427(652)

Factor out 652:

652(523 + 427)

Explanation

To find the value of (4 + a)(4 - b), substitute a = 4 and b = -4:

(4 + 4)(4 - (-4))

= (8)(8)

= 64

Explanation

To find the value of K:

K = 6 × 17

= 102

= 2 × 102 = 204

Explanation

This merchant deals in silk goods.

یہ سوداگر ریشم کے سامان کا کاروبار کرتا ہے۔

The preposition "in" is used to indicate the type of goods a merchant trades or specializes in.