Explanation

Two trains each of length 150m are running in opposite directions at the same speed,

If they cross each other in 15 seconds,

36 is the speed of each train in Km per hour

Explanation

$$\text{Fans}\propto \text{Machines}\times \text{Days}$$

Let $x$ be the number of fans produced in 12 days with 16 machines.

Set up the proportion:

560/20×7=x/16×12​

560/140​=x/192​
4=x/192​⇒x=4×192=768​

Explanation

1: Calculate the total sum of the five numbers:

Total Sum=Average×Number of items=24×5=120

2: Subtract the known number (30) from the total sum to find the sum of the other four numbers:

Sum of the other four numbers=120−30=90

Explanation

Apart from the sign,

the magnification factor, m, is equal to i/o

"I" is the image distance from the lens 

"o" is the object distance.

we have m=i/o

(8cm) / (20cm)

= 2/5.

Explanation

40 years is the correct answer.

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AGM 18-12-2022

Explanation

The sum of the ages (in years) of both people is equal to the perfect square of 8.

So, a perfect square of 8 = 64.

Therefore, the sum of ages (in years) of both people = 64 years.

Now,

Let, the age of Irfan's be x.

Then, the age his father's be 3x.

According to the question :

➮ x + 3x = 64

➮ 4x = 64

➮ x = 64/4

➮ x = 16.

ND5-07-2023

Explanation

Let there be x pupils in the class.

Total increase in marks = (x * 1/2) = x/2

x/2 = (83 – 63) => x/2 = 20 => x = 40

Explanation

Sum of the 5 number = -10 * 5 = -50

Sum of the 3 numbers = 16

Sum of other 2 numbers = -50 - 16 = -66

Average of the 2 numbers = -66/2 = -33.

Explanation

30 min=40 pages

1hour = 80 pages

17×80=1360

So,17 hours

30min = 40 pages 1 hour = 80 pages Which means he reads 80 pages in one hour dividing 1360 by 80 ye get ans 1360÷ 80= 17

Explanation

If you are the 11th person in the queue then there will be 10 people ahead of you

and there will be 10 people behind you including you there will be 10+10+1= 21 people in the queue.