Question

82. I think of a decimal number. After I have subtracted 2.9 from it,
multiplied the result by 3 and then added 0.15, I get 10.5. What
decimal number I am thinking of ?
A) 4.5
B) 15.66
C) 20.10
D) None of these​

Answer 1

Answer:

None of these

Step-by-step explanation:

We can do this question by putting the all given values of options first, We need to determine the equation given in the question

Let the decimal number be x

So now it is saying subtract 2.9 from it i.e.=x-2.9

Now the result is multiplied by 3 i.e.=$[x-2.9]\times3$

And then 0.15 is added to the resultant i.e.=$[x-2.9]\times3+0.15$

Therefore the above equation is our final equation, In the above equation we need to put the values given in question in the place of x and we should get 10.5 as answer

Therefore if we put x=4.5, We would get 4.95

If we put x=15.66, We would get 38.43

If we put x=20.10, We would get 51.75

Answer 2

Answer:

We can do this question by putting the all given values of options first, We need to determine the equation given in the question

Let the decimal number be x

So now it is saying subtract 2.9 from it i.e.=x-2.9

Now the result is multiplied by 3 i.e.=[x-2.9]\times3[x−2.9]×3

And then 0.15 is added to the resultant i.e.=[x-2.9]\times3+0.15[x−2.9]×3+0.15

Therefore the above equation is our final equation, In the above equation we need to put the values given in question in the place of x and we should get 10.5 as answer

Therefore if we put x=4.5, We would get 4.95

If we put x=15.66, We would get 38.43

If we put x=20.10, We would get 51.75