posted by Isis on .
Wesley and Delia are playing a math game. Wesley gives Delia these step to follow.
Step 1: Multiply a number by 6 and then subtract by 4.
Step 2: Divide the result by 2
Step 3: Add 3 to the result from the second step.
If Delia's final answer is 19, What was the original number?
PLEASE HELP ME!!!
suppose you pick x
1: 6x - 4
2: (6x-4)/2 = 3x-2
then 3x-2 = 19
3x = 21
x = 7
Delia picked 7
or you can just do everything with inverse operations on reverse order
last thing she did was divide by 2
so first thing we do is multiply by 2
19x2 = 38
the middle thing she did was subtract 4, so we will add 4
the first thing she did was to multiply be 6, so the last thing we will do is divide by 6
42÷6 = 7
How about that ???
i guess it will help.. thank you :)