Question

The difference between a number and its two-fifth is 510. What is 10% of that number ?
A) 75
B) 85
C) 95
D) 105

Answer 1

x-2/5x = 510 

3x/5 = 510 

x = 510×5 / 3 =850

10 % 0f 850 = B) 85.

Answer 2

Answer:

10% of that number is 85.

Step-by-step explanation:

Step 1:

Let the number be x.

Step 2:

So, from the language given,

X – 2/5 x = 510

Step 3:

Simplify the equation,

Or, 3/5 x = 510

Or, x = 5/3 x 510

So, x = 850.

Step 4:

Now, we're asked 10% of the number, that is, 10% of x.

So, required quantity = 10/100 x x = 1/10 x 850 = 85.