Question

If 1/8 is subtract from a number and the difference is multiplied by 8 the result is 15 the number is
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Answer 1

Answer:

r={2}

PREMISES

8r-1=15

ASSUMPTIONS

Let r=the number

CALCULATIONS

8r-1=15

8r/8-(1-1)=(15+1)/8

r-0=16/8

r=

2

PROOF

If r=2, the equations

8r-1=15

8(2)-1=15

16-1=15 and

15=15 establish the root (zero) r=2 of the statement 8r-1=15

C.H.

Answer 2

Answer:

According to the mathematical Order of operations and the wording of this paragraph (no higher order of operations supercedes this) you must multiply by the variable before subtracting. So setting up the equation looks like this:

8X-1=15

In efforts to get the unknown,X, on one side of the equation by itself add 1 to both sides of the equation to get:

8X-1+1=15+1

8X = 16

Then divide both sides of the equation by 8:

8X/8 = 16/8

X = 2. Answer