Explanation

 The average life expectancy of a cuttlefish is about 1–2 years.

Explanation

The sentence "Our task had been completed before sunset" is converted to active voice,

You simply need to switch the subject and object, making "We" the subject and "our task" the object, resulting in "We had completed our task before sunset.". 

Passive voice structure: "Object + had been + verb (past participle) + by subject". 

Active voice structure: "Subject + had + verb (past participle) + object". 

Explanation

The sum of odd integers from 1 to 100 are - 1 + 3 + 5 + 7 + ……… + 99.

This is an Arithmetic Progression with the following parameters: First Number, a = 1 Last Number, l = 99 Common Difference, d = 2 So, the Number of terms in the Arithmetic Progression, n = (l - a)/d + 1 = (99 - 1)/2 + 1 = 98/2 + 1 = 49 + 1 = 50 So, the sum of the Arithmetic Progression, S = n/2(l + a) = 50/2(99 + 1) = 25 X 100 = 2500 So, the sum of odd integers from 1 to 100 = 2500

Explanation

The rate at which Masons build walls is what we need to understand with this problem.

15*X = 20

15*X/20 = 1 Wall

Therefore, a fifteenth of a wall can be built by one mason in 20 days.

Each day, a mason can build 1/(15*20) or 1/300th of an entire wall.

Therefore, it would take one mason 300 days to build a wall on their own.

It would take 15 masons 20 days (300/20) to build a wall.

And we can estimate the 12 day solution with the following formula:

300/12 = 25

It would take 25 masons 12 days .

Explanation

The Yemeni Crisis began with the 2011–12 revolution against President Ali Abdullah Saleh, who had led Yemen for more than three decades

key events in the Yemeni Crisis:

2011 — Saleh's Resignation: 

Protests led President Ali Abdullah Saleh to resign, transferring power to Abdrabbuh Mansur Hadi.

2014 — Houthi Takeover: 

In September, Houthi rebels seized Sana'a, ousting Hadi's government.

2015 — Saudi-Led Intervention:  

A Saudi-led coalition intervened in March to support Hadi, escalating the conflict.

2017 — Saleh's Death: 

The Houthis killed former President Saleh in December after seeking to reconcile with the coalition.

2022 — UN Ceasefire: 

A UN-brokered ceasefire in April provided temporary relief, but the conflict remains unresolved.

Explanation

Explanation

Covid-19 deaths in the United States topped 200,000 on September 19, 2020 while more than 6,740,400 confirmed cases were also recorded.

Explanation

China has successfully landed a robot on the surface of Mars on 15 May 2021.

China has become the third country after Russia and the United States of America in history

The rover 'Zhurong' will spend around 90 Martian days on the planet.

A Martian day is around 24 hours and 39 minutes.

This rover is named after the mythical Chinese god of fire.

Explanation

The Ghauri–I is a land-based surface-to-surface medium-range ballistic missile.

It is Ballistic missile  developed by Khan Research Laboratories of Pakistan. 

The Ghauri-II missile has a maximum range of 2,000 km

Explanation