SOLUTION: I need to know how to solve and explain the decimal problems. "Find the unknown number." 1). _____ x 0.05 = 0.04 2). 0.05 x ______ = 0.02 3). _______ x 0.08 = 0.04

Algebra ->  Decimal-numbers -> SOLUTION: I need to know how to solve and explain the decimal problems. "Find the unknown number." 1). _____ x 0.05 = 0.04 2). 0.05 x ______ = 0.02 3). _______ x 0.08 = 0.04      Log On


   



Question 1206700: I need to know how to solve and explain the decimal problems.
"Find the unknown number."
1). _____ x 0.05 = 0.04
2). 0.05 x ______ = 0.02
3). _______ x 0.08 = 0.04

Found 2 solutions by math_tutor2020, MathLover1:
Answer by math_tutor2020(3816) About Me  (Show Source):
You can put this solution on YOUR website!

I'll do problem 1 to get you started.

something * 0.05 = 0.04
To isolate the "something", we need to undo what is happening to it.
We need to undo the multiplication.

To undo multiplication, we divide both sides by 0.05
something = 0.04/0.05 = 4/5 = 0.8

As a check,
0.8 * 0.05 = 0.04
0.04 = 0.04
which confirms we have the correct value to fill in the blank.

Problems 2 and 3 will follow a similar pathway.

Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

let unknown be x
1).
+x%2A+0.05+=+0.04
x=0.04%2F0.05
x=0.8
so,+0.8%2A+0.05+=+0.04


2).
0.05+%2Ax+=+0.02
x=0.02%2F0.05
x=0.4
=> 0.05+%2A0.4+=+0.02

3).
x%2A+0.08+=+0.04
x=0.04%2F0.08
x=0.5
=>0.5%2A+0.08+=+0.04