Explanation

90 percent *90

= (90/100)*90

= (90*90)/100

= 8100/100

= 81

Explanation

Number of boys present: 50% of 100 = 0.5 x 100 = 50 boys

Number of girls present: 40% of 900 = 0.4 x 900 = 360 girls

Total students present = Boys present + Girls present

= 50 + 360

= 410

Now, let's find the percentage of students present:

Total students = Boys + Girls = 100 + 900 = 1000

Percentage of students present = (Total students present / Total students) x 100

= (410 / 1000) x 100

= 41%

Explanation

Let us convert the given word expression into a numerical format by deriving each term and its operation.

The operation of multiplication or 'x' in words is 'times'.

Eight times of a number b is denoted by 8xb = 8b.

Ten times of a number c is denoted by 10xc = 10c.

The operation of subtraction is denoted by ' - '.

Since we are subtracting eight times the number b from ten times the number c, we will write the term 10c first and then place the operation sign (of subtraction), which is followed by the next term 10c.

Hence, the required expression is = 10c- 8b.

ND12_8_2023

Explanation

(60/100) * X + 120 = X

2X = 600

X = 300

Explanation

40 is subtracted from 60% of a number, the result is 50

(60/100) * X – 40 = 50

6X = 900

X = 150

Explanation

Let's denote the present age of A as 3x and B as 4x.

Step 1: Express their ages 10 years ago

A's age 10 years ago = 3x - 10

B's age 10 years ago = 4x - 10

Step 2: Formulate the equation based on the given information

A was half of B's age 10 years ago:

3x - 10 = 1/2 * (4x - 10)

Step 3: Solve the equation

3x - 10 = 2x - 5

3x - 2x = -5 + 10

x = 5

Step 4: Find their present ages

A's age = 3x = 3 * 5 = 15

B's age = 4x = 4 * 5 = 20

Step 5: Calculate the total of their present ages

Total age = 15 + 20 = 35

Explanation

Zakat is typically 2.5% of the total wealth.

To find the total amount, divide the Zakat paid by 0.025 (8500 ÷ 0.025 = 340,000).

Explanation

Explanation

20% of the 80

=20/100*80

=1/5*80

=1*16

=16

Explanation

Let's find the purchase price (cost price):

Selling price = Rs 25,000

Loss percentage = 20%

Let the cost price be x.

Since Naeem suffered a 20% loss:

Selling price = Cost price - Loss

25,000 = x - 0.20x

25,000 = 0.80x

Divide both sides by 0.80:

x = 25,000 / 0.80

x = 31,250