Question

By what number must a given number be multiplied to decrease it by 30%​

Answer 1

Answer:

Your answer is 0.7

Step-by-step explanation:

Let X be a no. ..

It is multiplied with y and X is decreased by 30%....

So,

$x \times y = x - \frac{30x}{100}$

....... eq 1

Now , from eq. 1 we get

$y = \frac{100x - 30x}{100x}$

...... eq 2

On solving we get

$y = \frac{7}{10} = 0.7$

So, the no. must be multiplied with 0.7 to reduce it by 30% ....

Hope this helps you ......

Answer 2

Let the number be X

=Decrease = 30%of x

= 30/100*x = 30x/100

Decreased value = ( x-30x/100)

= 70/100=7/10 Ans.