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Explanation

The sum of the 5 numbers is:

5 × 23 = 115

The sum of the 4 numbers is:

4 × 25 = 100

The fifth number is:

115 - 100 = 15

Explanation

The Angstrom (Å) is commonly used to measure wavelengths of light, where

1 Å = 10⁻¹⁰ meters.

Light wavelengths typically range from 4000 Å to 7000 Å.

Explanation

2880 = 2⁶ × 3² × 5.

To make it a perfect square, we need to divide by 5 because it's the only prime factor with an odd exponent.

Explanation

Sodium chloride (NaCl), commonly known as table salt.

It is the main salt dissolved in seawater.

Explanation

He asked his servant what he had done with the watch.

In indirect speech, we shift the tense one step back.

"Has done" (present perfect) changes to "had done" (past perfect).

Because the reporting verb "asked" is in the past tense.

Explanation

To find the number of games won, calculate 40% of 160:

40% of 160 = 0.4 × 160 = 64

Games lost = Total games - Games won

= 160 - 64

= 96

The team won 64 games and lost 96 games.

Explanation

Given:

Two angles are 36° and 44°.

The sum of angles in a triangle is 180°.

Let's find the third angle:

Third angle = 180° - (36° + 44°)

= 180° - 80°

= 100°

Explanation

In ideal projectile motion, gravity is the only significant force acting downward on the object.

Air resistance is usually neglected, so gravitational force controls the curved path.

Explanation

Given the equation:

78.36 = 78.36xy

Dividing both sides by 78.36:

1 = xy

The only option that satisfies xy = 1 is:

x = 1 and y = 1

Since 1 × 1 = 1.

The answer is x = 1 and y = 1.

Explanation

People will blame you for wasting your vote.

The correct preposition after "blame" is "for", not "with".

"Blame you with" is incorrect.

Correct usage: "blame someone for something."