Explanation

Explanation

Ratio of boys to girls = 2:3

Number of boys = 12

Let's find the multiplier:

2x = 12

x = 6

Now, find the number of girls:

3x = 3 * 6

= 18

Explanation

Explanation

To calculate the mean, add all the numbers together and divide by the total number of values.

(10 + 16 + 20 + 22) / 4 = 68 / 4 = 17.

Explanation

Mean = Total sum ÷ 3 → Total = 15 × 3 = 45

Given ages = 10 and 20 → Sum = 30

Third age = 45 − 30 = 15

Explanation

Calculate stepwise:

120% of 6250 = (120/100) × 6250 = 7500

12% of 7500 = (12/100) × 7500 = 900

20% of 900 = (20/100) × 900 = 180

Explanation

Step 1: Let the marked price be Rs. x.

Since items are sold at 10% less than the marked price,
The selling price (SP) = $x-10\%\text{ of }x=0.9x$

Step 2: Desired profit = 10% on cost

Cost price (CP) = Rs 90
Profit = 10% of 90 = Rs 9
So, desired Selling Price (SP) =Rs 90 + Rs9 = Rs 99

Step 3: Set up the equation

We already said that the selling price is 0.9x, so:

$$0.9x = 99$$

Step 4: Solve for x

$$x = frac{99}{0.9} = 110$$

Explanation

Given:

- Speed of train = 30 m/s  

- Time to cross bridge = 20 s  

- Length of bridge = 400 m  

Total distance covered = Speed × Time = 30 × 20 = 600 m  

So, length of train = 600 - 400 = 200 m

Correct answer: 200 m 

Explanation

15 ÷ 3 = 5

5 + 20 = 25

Explanation

The true statement about an Arithmetic Progression (A.P.) is that the difference between any two consecutive terms is constant.