How do you solve 0.1d-0.03+0.3d=0.25?

Jan 7, 2016

$d = \frac{7}{10} = 0.7$

Explanation:

Yuo can thinking that:

$d = x$

then to find d you have to solve the equation

$0.1 x - 0.03 + 0.3 x = 0.25$

Addiction the terms in x and move the not x terms on the right of =

$0.4 x = 0.25 + 0.03$

$0.4 x = 0.28$

Converting the decimal number in fractions

$\frac{4}{10} x = \frac{28}{100}$

Finding the

$m . c . d . = 100$

$\frac{10 \cdot 4 x}{100} = \frac{28}{100}$

$\frac{40 x}{100} = \frac{28}{100}$

$40 x = 28$

$x = \frac{28}{40}$

Semplyfing fraction by 4

$x = {\cancel{28}}^{7} / {\cancel{40}}_{10} = \frac{7}{10}$

Then:

$x = d = \frac{7}{10}$