Explanation

"Almost each day" is grammatically incorrect.

The correct phrase is "Almost every day", which is standard usage for frequency.

Explanation

Tense: Future simple (will buy)

Passive structure: will be + past participle

"buy" → bought (past participle)

Subject "he" → him

Reflexive pronoun remains: for himself

Correct passive voice:

A ticket will be bought by him for himself.

Explanation

The formula for the sum of the first n natural numbers is:

S(n) = n(n + 1) / 2

Given S(100) = 5050, let's calculate S(200):

S(200) = 200(200 + 1) / 2

= 200 * 201 / 2

= 100 * 201

= 20100

Explanation

The sentence is in past perfect continuous tense, and it remains the same in indirect speech.

Pronouns are adjusted appropriately: I → he.

No tense change is needed after "said" when past perfect continuous is used.

Final sentence: Hyder said that he had been gardening for two hours.

Explanation

Normal price = Sale price + Amount saved

= 150 + 50

= 200

Discount percentage = (Amount saved / Normal price) × 100

= (50 / 200) × 100

= 25%

Explanation

The atomic weight of Mercury (Hg) is 200.59 unified atomic mass units (u), as listed on the periodic table.

Key Information:

• Symbol: Hg (from Latin Hydrargyrum)
• Atomic Number: 80
• Standard Atomic Weight: 200.592 u (often rounded to 200.59 u).

Explanation

The sentence: "Islamabad is further from Lahore than it."

The word "further" is incorrect in comparison between two places (distance).

For physical distance, we use "farther", not "further."

Correct sentence: Islamabad is farther from Lahore than it.

Explanation

The sentence expresses a wish or prayer, so in indirect narration we use "prayed".

Changes:

• "May" → "might"
• "here" → "there"

So, the correct indirect narration is:

They prayed that train might reach there in time.

Explanation

Louis Pasteur (1822–1895) was a pioneering microbiologist and chemist whose work bridged both fields:

As a Chemist:

• Discovered molecular chirality (optical isomers).
• Studied fermentation, proving it was caused by microorganisms.

As a Microbiologist:

• Developed pasteurization (heat treatment to kill microbes in food).
• Created vaccines for rabies and anthrax.
• Disproved spontaneous generation (germ theory of disease).

Explanation

Let's break it down:

(x + y + z) / 3 = 15

x + y + z = 45

(y + z + w) / 3 = 16

y + z + w = 48

Given w = 19:

y + z + 19 = 48

y + z = 29

Now, substitute y + z in the first equation:

x + 29 = 45

x = 16