SOLUTION: twenty-one is three times the difference between four times a number and five. find the number.

Question 866: twenty-one is three times the difference between four times a number and five. find the number.
Answer by usyim88hk(158) (Show Source): You can put this solution on YOUR website!
First, make an equation!!!
Let the number be x:
or (Let's slove the first one first)
------------------------------------------------------------------------------
First equation:

7 = 4x-5
7+5 = 4x-5+5
12 = 4x
[x = 3]
------------------------------------------------------------------------------
Second equation:

7 = 5-4x
7+4x = 5
4x = -2
[x = -1/2 or -0.5]
------------------------------------------------------------------------------
[x = 3 or -0.5] (ANSWER!!!!)
RELATED QUESTIONS
Three times the difference between a number and twenty-one is fifty. Find the... (answered by nyc_function)

Four times a number is three times the difference between thirty five and the number.... (answered by bucky)

the difference between three times a number and four is five times the number. Find the... (answered by oberobic)

the difference between three times a number and four is five times the number. find the... (answered by stanbon)

"Twice the difference between a number and twenty-five is three times the number. Find... (answered by mananth)

Twice the difference between four times a number and five is six. Find the... (answered by addingup,josgarithmetic)

Five times the difference of a number and three is four less than four times the number.... (answered by farohw)

"Four times a number is three times the difference between thirty-five and the number.... (answered by edjones)

Five times the difference of twice a number and eight is negative twenty. Find the... (answered by rfer)