Question

Find the value of x if $0.8 \times x = 0.0004$?
A 0.0005
B 0.005
C 0.5
D 0.00005

Answer 1

Hint: To solve this question we just need to use some arithmetic operations and properties as while solving this equation we will divide the equation both sides by 0.8 for simplifying the variable side. And after that the variable and constant term has been simplified and separated. In the next step we would calculate the value of x by dividing 0.0004 by 0.8 and will get the answer.

Complete step by step answer:
In this question we have been provided with an equation for which we are supposed to find the value of x
$0.8 \times x = 0.0004$
Now for simplifying the equation a little bit we will divide the equation with 0.8 on both sides$\dfrac{{0.8 \times x}}{{0.8}} = \dfrac{{0.0004}}{{0.8}}$
Now on the variable side 0.8 will be cancelled out and we will be left with just the variable x whose value we need to calculate $x = \dfrac{{0.0004}}{{0.8}}$
Now our equation has been simplified and we have separated the variables and constants using arithmetic operations and properties. In the next step we will divide 0.0004 with 0.8 to find the value of $x = 0.0005$
x comes out to be 0.0005 which is your option number (a)

So, the correct answer is “Option a”.

Note: In this question, be a little bit cautious while dividing 0.0004 with 0.8 and remove the decimals carefully without making any kind of mistake in that step. Also, as we have 4 options in this question, we can keep those values one by one in the given equation but this method can be a little bit hectic and chances of mistakes can increase in such a way of solving due to more decimal places.