Explanation

• Avg of 6 numbers = 30
• Sum of 6 numbers = 6 x 30 = 180
• Avg of first 4 numbers = 25
• Sum of first 4 numbers = 4 x 25 = 100
• Avg of last 3 numbers = 35
• Sum of last 3 numbers = 3 x 35 = 105
• Now, let's find the 4th number:
• Sum of first 3 numbers = Sum of first 4 numbers - 4th number
• = 100 - 4th number
• Sum of first 3 numbers = Sum of all 6 numbers - Sum of last 3 numbers
• = 180 - 105
• = 75
• So, 75 = 100 - 4th number
• 4th number = 100 - 75
• = 25

Explanation

Be worried about something means کسی چیز کے بارے میں فکر مند ہونا

میں اپنے امتحانات کیلئے فکرمند ہوں۔

Explanation

Tooth enamel is the white, visible part of the tooth and it is also the hardest part of the human body.

 The main mineral composition is hydroxyapatite, a crystalline of calcium phosphate.

Explanation

To have or do two good things at the same time that are impossible to have or do at the same time.

چوپڑیاں اور وہ بھی دو دو کی خواہش

Explanation

Symbol: H

Atomic mass: 1.00784 u

Atomic number: 1

Named by: Antoine Lavoisier (1783)

Explanation

The party continued its political activities in a clandestine way soon after formation.

It was banned in July 1954.

Explanation

"He is an M.A."

The article "an" is used before abbreviations that start with a vowel sound, like "M.A."

Explanation

Maulvi Nazir Ahmad Dehlvi, also known as Deputy Nazir Ahmad.

Born: 1830, Rehar, India

Died: May 3, 1912, Delhi, India

Nationality: Indian

Explanation

 Lord Linlithgo was the Viceroy in India during the Second World War.

 Hitler's attack on Poland in September 1939.

Hitler's self-destruction and  unlimited acquiescence on 8 May 1945.

Explanation

Generally the word afraid takes preposition of.

Afraid of snakes, afraid of dogs, afraid of animals etc.

Afraid of means خوفزدہ