Solve $0.4x + 1.2 = 0.1x + 3$ .

0.6Correct answerYour answer6Correct answerYour answer14Correct answerYour answer60Correct answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer B

Correct answer: B

Move terms: $0.4x - 0.1x = 3 - 1.2$ .
So $0.3x = 1.8$ .
$x = \frac{1.8}{0.3} = 6$ .

Worth noting

Multiplying the whole equation by 10 first $(4x + 12 = x + 30)$ removes the decimals and the risk of a slipped decimal point, which is where 0.6 and 60 come from.

Concept: Linear equation with decimal coefficients
Typical timeTypical: 40 s
Your timeYours: —

The rule this testsLinear equations in one variable

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Solve 0.4x+1.2=0.1x+30.4x + 1.2 = 0.1x + 30.4x+1.2=0.1x+3.

Explanation

Solve $0.4x + 1.2 = 0.1x + 3$ .