Explanation

Given:

- Average age of 5 members = 21  

  → Total age of 5 members = 21 × 5 = 105

- When grandfather is included (6 members), average becomes 21 + 9 = 30  

  → Total age of 6 members = 30 × 6 = 180

Now, Grandfather's age = 180 – 105 = 75 years

Explanation

• 10 Downing Street, colloquially known as Number 10.
• It is the official residence and office of the British Prime Minister.
• It located on Downing Street in London's City of Westminster.

Additional information:

• It was constructed between 1682 and 1684 by architect Kenton Couse.
• The building, over 300 years old, boasts approximately 100 rooms.
• It was officially designated on 14 January 1970.

Last verified on 02-02-2026

Explanation

The USA film industry Hollywood, is located in Los Angeles, California.

Daeida Wilcox, who donated land to help in the development of Hollywood,

Hollywood was incorporated as an independent municipality in 1903.

It was consolidated with the City of Los Angeles in 1910

Explanation

Napoleon Bonaparte was the first emperor of France (1804–14/15).

He was born on August 15, 1769, in Ajaccio, France

He was later known by his regnal name Napoleon I

He was defeated in the Battle of Waterloo in 1815

The British exiled Napoleon Bonaparte to the remote island of Saint Helena in the Atlantic,

Where he died in 1821 at the age of 51

Explanation

B covers 28 meters in 7sec. So, B’s time over the course = (7/28)*1000 =250 sec.

Whereas A’s time over the course = 250 -7 = 243 sec.

i.e A’s time over the course is 4min, 3 sec

Explanation

The Pious Caliphs were the first four Caliphs.

They were:  Abu Bakr, Umar, Uthman, Ali

The first Caliph who helped spread Islam was Muhammed's father-in-law, Abu-Bakr.

He served for only 2 years, from 632 to 634

Hazrat Abubakar (RA) was the first Pious Caliph of Islam.

Hazrat Abubakar (RA) became caliph in 632 AD.

Hazrat Abubakar (RA) died in 634 AD.

The Pious Caliphs were the first four Caliphs.

They were:  Abu Bakr, Umar, Uthman, Ali

ND5-5-2023

Explanation

Plants produce sugar and starch using sunlight through photosynthesis.

It is a process where light energy converts carbon dioxide and water into glucose and oxygen.

Explanation

The idiom "To bury the hatchet" means to make peace or resolve a conflict.

It originates from a Native American custom of burying weapons as a sign of truce.

Explanation

The pattern of the series is:

+1, +2, +3, +4, +5...

So, the next difference should be +6:

16 + 6 = 22

The correct answer is 22.

Explanation

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Last updated question by NA on 07 May 2026