Explanation

Let's denote Umar's current age as x.

Noor's current age = x + 8

After 3 years:

Umar's age = x + 3

Noor's age = x + 8 + 3 = x + 11

According to the problem:

x + 3 = 1/3 * (x + 11)

3(x + 3) = x + 11

3x + 9 = x + 11

2x = 2

x = 1

Explanation

The root stock is the bottom portion of the plant that is used for grafting.

It provides the root system and supports the scion.

The scion is the top portion of another plant that is grafted onto the root stock to grow and produce the desired fruit or flowers.

Explanation

The correct structure in English is Subject (I) + Adverb (rarely) + Verb (see) + Object (such natural beauty).

This forms a grammatically correct and natural-sounding sentence.

Explanation

Red Blood Cells (RBCs) are disc-shaped with a central depression (biconcave), not irregular in shape.

Their regular shape helps efficient oxygen transport throughout the body.

Explanation

Neuter gender refers to non-living things; knife is an object, so it is neuter.

Mother and wife are feminine (living beings).

Explanation

The gall bladder stores and concentrates bile produced by the liver.

Bile helps in the digestion and absorption of fats in the small intestine.

Explanation

"Neater" is the correct comparative form of the adjective "neat" to compare two things.

The comparative adjective "neater" is used to show the difference between two items (his handwriting vs. hers).

Explanation

Given:

Height of the hill = 240 m

Angle of depression to the top of the minaret = 30°

Angle of depression to the bottom of the minaret = 60°

Let's denote the distance from the base of the hill to the minaret as x.

For the bottom of the minaret (60° angle):

tan(60°) = 240 / x

√3 = 240 / x

x = 240 / √3

For the top of the minaret (30° angle):

tan(30°) = (240 - h) / x

1/√3 = (240 - h) / (240 / √3)

Simplifying:

240 - h = 240 / 3

240 - h = 80

h = 160

Explanation

The liver typically weighs between 1400 to 1600 grams in healthy adult individuals.

It is the largest internal organ.

It plays vital roles in metabolism and detoxification.

Explanation

Reconstructionism believes that societal problems can be addressed by implementing significant changes in the educational system.

This philosophy focuses on using education to reshape society and promote social progress.