Explanation

To find the percentage equivalent to 21/4, we need to convert the fraction to a decimal and then multiply by 100.

21 ÷ 4 = 5.25

Multiply by 100:

5.25 × 100 = 525%

Explanation

The Roman numeral "XX" represents the number 20.

Each "X" stands for 10.

So two "X"s add up to 20.

Roman numerals for the given numbers:

• 1 - I
• 5 - V
• 10 - X
• 50 - L
• 100 - C
• 500 - D

Explanation

Given,

70% of students are boys.

Then, 30% of students are girls.

( Because the total will be 100%)

We know that, number of girls is 504.

Let the total number of students be x.

Then, 30% of x = 504.

So, 30/100 * x = 504

So, x = 504 * 100/30

So, x = 1680 students

Then, the number of boys is 1680 - 504 = 1176

Therefore, there are 1176 boys in the school.

Explanation

To evaluate this expression, we need to follow the order of operations (PEMDAS):

• Evaluate the expression inside the square root:

√2401 = 49 (exactly!)

• Add 176 to the result:

176 + 49 = 225

• Take the square root of the sum:

√225 = 15 (exactly!)

So, the correct answer is: 15

Explanation

The square root of 6492304 is:

√6492304 = 2548

Explanation

Answer Expert Verified

4.3/5

48

snehitha2

Genius

4.1K answers

7.2M people helped

Let the number be x

1/4 of the number = 1/4(x) =x/4

1/3 of the number = 1/3(x) =x/3

1/4 of a number subtracted from 1/3 of the number gives 12.

x/3-x/4 =12

x/3×4/4 - x/4×3/3 =12

4x/12 - 3x/12 =12

(4x-3x)/12=12

4x-3x=12×12

Explanation

The Roman numeral "XVI" represents the number 16.

"X" stands for 10.

"V" for 5.

"I" for 1.

Roman numerals for the given numbers:

• 1 - I
• 5 - V
• 10 - X
• 50 - L
• 100 - C
• 500 - D

Explanation

1. Let Ali's speed be x kmph. Then, the time taken by Ali to cover 30 km is 30/x hours.

2. Since Ali takes 2 hours more than Raza, the time taken by Raza to cover 30 km is (30/x) - 2 hours.

3. If Ali doubles his speed, his new speed is 2x kmph. The time taken by Ali to cover 30 km at this new speed is 30/(2x) hours.

4. According to the problem, if Ali doubles his speed, he would take 1 hour less than Raza. So, we can set up the equation:

(30/x) - 2 = (30/(2x)) - 1

Simplifying the equation, we get:

30/x - 2 = 15/x - 1

Multiplying both sides by x, we get:

30 - 2x = 15 - x

Simplifying further, we get:

x = 5

So, Ali's speed is 5 kmph.

Explanation

The pattern alternates between multiplying by 2 and subtracting 8:

14 × 2 = 28

28 - 8 = 20

20 × 2 = 40

40 - 8 = 32

32 × 2 = 64

64 - 8 = 56

Explanation

Profit = Selling Price - Cost Price = Rs. 392 - Rs. 350 = Rs. 42

Percentage of Profit = (Profit / Cost Price) × 100

= (42 / 350) × 100 = 12%