Question

if 10% of number is 7 what is 80% of the number

Answer 1

Let the number be x
10% of x = 7
10/100 *x = 7
1/10 *x = 7
x = 7*10
x = 70

80% of 70 = 80/100*70 = 56

Answer 2

Given,

10% of a certain number is 7.

To find,

The value of 80% of that certain number.

Solution,

We can simply solve this mathematical problem using the following process:

Let us assume that the certain number is x.

Mathematically,

p% of a number A is calculated as follows;

(p/100)×A

{Statement-1}

Now, according to the question;

10% of the certain number is = 7

=> (10/100)×x = 7

{according to statement-1}

=> x/10 = 7

=> x = 70

=> the certain number = 70

Now, according to statement-1;

The value of 80% of that certain number

= (80/100)×x

= (4/5) × 70

= 56

Hence, the value of 80% of the given certain number is equal to 56.