Equation Madness

Algebra Level 1

Let 5 x + 3 × 4 = 74 5x+3 \times 4=74 . What is x x ?


The answer is 12.4.

Daniel Feng by Daniel Feng , 18, USA

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4 solutions

Mohammad Khaza
Jul 29, 2017

here it is: 5 x + 3 × 4 = 74 5x+ 3 \times 4=74

or, 5 x + 12 = 74 5x+12=74

or, 5 x = 62 5x=62

or, x = 62 5 x=\frac{62}{5}

or, x = 12.4 x=12.4

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Ashish Menon
Jun 29, 2016

5 x + 3 × 4 = 74 5 x + 12 = 74 5 x = 74 − 12 5 x = 62 x = 62 5 = 12.4 \begin{aligned} 5x + 3×4 & = 74\\ 5x + 12 & = 74\\ 5x & = 74-12\\ 5x & = 62\\ x & = \dfrac{62}{5}\\ & = \color{#3D99F6}{\boxed{12.4}} \end{aligned}

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Hung Woei Neoh
Jun 6, 2016

5 x + 3 × 4 = 74 5 x + 12 = 74 5 x = 62 x = 12.4 5x+3 \times 4 = 74\\ 5x+12 = 74\\ 5x = 62\\ x=\boxed{12.4}

1 Helpful 0 Interesting 0 Brilliant 0 Confused

Yes! Correct!

Daniel Feng - 5 years ago
Daniel Feng
Jun 6, 2016

74-12 is 62, and 62/5=12.4

1 Helpful 0 Interesting 0 Brilliant 0 Confused

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