Question

20. I think of a decimal number. I have subtracted 2.9 from it and then divided by 0.8. Now, if I add 0.6, I get 8.6. What is the decimal number? a. 18 b. 4.5 C. 6.04 d. 9.3​

Answer 1

Answer:

If from a decimal number 2.9 is subtracted and the result is divided by 0.8 and then the result is added with 0.6, and we get 8.6, then the decimal is 9.3

Step-by-step explanation:

Let us take x as the decimal number

Given

$\frac{x-2.9}{0.8} +0.6 = 8.6$

That. Is,

$\frac{x-2.9}{0.8} +0.6 = 8.6\\\\\frac{x-2.9+(0.6*0.8)}{0.8} = 8.6\\\\x -2.9+0.48 = 8.6* 0.8\\\\x-2.42 = 6.88\\\\x = 6.88+2.42\\\\x = 9.3$

So the decimal number is 9.3