Correct Answer: 429 : 370

Solution : According to the question,
Average number of students in A $=\frac{640 + 800 + 500 + 700 + 900 + 750}{6}=\frac{4290}{6}$ 
Average number of students in B $=\frac{550 + 820 + 600 + 750 + 500 + 480}{6}=\frac{3700}{6}$
⇒ Required ratio = $\frac{\frac{4290}{6}

Correct Answer: 18 days

Solution : Let $x$ be the number of days Tapas takes to complete the whole work.
So, Mihir takes = 2$x$ days
According to the question,
$\frac{1}{x}+\frac{1}{2x}=\frac{1}{12}$
$⇒\frac{2+1}{2x}=\frac{1}{12}$
$\therefore x$ = $\frac{3×12}{2}$ = 18 days
Hence, the correct answer is 18 days.

Correct Answer: Two lives

Solution : The correct option is two lives.

Amphibian is derived from the Greek terms amphia which means both, and bios which means life. The term "amphibian" literally means double life. This word represents the dual nature of many amphibians' lives since they frequently go

Correct Answer: 68

Solution :
The diagonals of a Rhombus are 16 cm and 30 cm.
We know diagonals perpendicularly bisect each other in a Rhombus.
Side of Rhombus = hypotenuse of the triangle formed by the halves of the diagonals.
Side of Rhombus = $\sqrt{(\frac{16}{2})^{2}+ (\frac{30}{2})^{2}}$
Side = $\sqrt{82+152}

Correct Answer: Jonas Salk

Solution : The correct answer is Jonas Salk.

American doctor Jonas Salk created the Inactivated Polio Vaccine (IPV), also known as the Salk vaccination, in the early 1950s. This was the first polio vaccine to be administered to a large number of people. This vaccine

Correct Answer: 1866

Solution : The correct answer is 1866.

The term "ecology" was coined by the German zoologist Ernst Haeckel in 1866 to describe the economies of living forms. The building of models of how living systems interact with their environment makes up the majority of the theoretical

Correct Answer: 42

Solution : Distance = 21 km
Let the usual speed of a motorcyclist be $x$ km/hr.
Time taken, t₁ = $\frac{\text{distance}}{\text{speed}}$ = $\frac{21}{x}$
When left late by $6\frac{6}{9}$ min = $\frac{1}{9}$hr,
Time, t₂ = travel time + waiting time
= $\frac{21}{(x+12)}+\frac{1}{9}$
According to the question,

Correct Answer: 750

Solution : The correct answer is 750.

Around 750 watts is equivalent to one horsepower. In the US, mechanical horsepower is frequently used to indicate an automobile's engine's maximum power. Compared to the metric horsepower used in Europe, it differs slightly. The standard unit of power is

Correct Answer: 31000

Solution : The average number of colleges
= $\frac{\text{Total number of colleges}}{\text{Total number of years}}$
= $\frac{80000+40000+20000+10000+5000}{5}$
= 31000
Hence, the correct answer is 31000.

Correct Answer: All of the above

Solution : The correct option is All of the above.

The spinal canal in the lower back narrows due to lumbar spinal stenosis. By removing the bony spurs and the vertebral bone walls, surgeons undertake laminectomy surgery to cure spinal stenosis. A procedure