Explanation

25 / 100 = 1 / 4 [ Dividing numerator and denominator by their HCF which is 25 ]

Explanation

Total time taken: T=2t

Average speed = d/t = 230t = 115 km/hr

Explanation

Incorrect:  I looked at me in the mirror

Correct: I looked at myself in the mirror

The reflexive pronoun and reflexive pronoun for singular first person 'I' is 'myself'.

Explanation

The world record for low temperature was set at Vostok Station, Antarctica, on 21 July 1983.

 a high ridge in Antarctica on the East Antarctic Plateau

where temperatures in several hollows can dip below minus 133.6° Fahrenheit (minus 92° Celsius) on a clear winter night 

Explanation

incorrect: I gave him as much as he could eat 

correct: I gave him as much as he could eat

Generally, both Gave and Could are used in Past Tense. 

Explanation

Homo sapiens, (Latin: “wise man”) is the species to which all modern human beings belong

All modern humans are classified into the species Homo sapiens, coined by Carl Linnaeus in his 1735 work Systema Naturae.

The generic name "Homo" is a learned 18th-century derivation from the Latin homō, which refers to humans of either sex.

Explanation

Let's assume the original length and width of the rectangle are L and W

Then, the original area of the rectangle is: A = L x W

If the width of the rectangle is decreased by 25%, its new width is:

W = W - 0.25W = 0.75W

If the length of the rectangle is increased by 16%, its new length is:

L = L + 0.16L = 1.16L

The new area of the rectangle is:

A = L x W

A = (1.16L) x (0.75W)

A = 0.87LW

So the new area is 0.87 times the original area.

This means that the new area is decreased by 13% compared to the original area.

Explanation

incorrect: All along the centuries, there have been wars

correct: All over the centuries, there have been wars

Over the centuries is one of the most popular phrases in English.

Explanation

Incorrect: They weren't artists they were detectives in disguise 

Correct: They weren't artists; they were detectives in disguise.

Explanation

incorrect: She will be very angry unless we do not reach there on time

correct: She will be very angry if we do not reach there on time

If is used to express a condition. 

We cannot use NOT after UNLESS.