Question

If a number is decreased by 70% of itself it gives 255 what is the number?​

Answer 1

Answer:

850

Step-by-step explanation:

Let the number be x so according to given condition

$x - \frac{70x}{100} = 255$

$\frac{100x - 70x}{100} = 255$

$30x = 25500$

$x = \frac{25500}{30}$

$x = 850$

Answer 2

Answer:

Let x be the orginal number

x is decreased by 70% of itself it give 255

ie x - 70%x = 255

x - (70/100) = 255

100x - 70x = 2550

30x = 2550

x = 2550/30

= 850

orginal number is 850