What is 30 percent of 4.2E+14 - step by step solution

Simple and best practice solution for 30% of 4.2E+14. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

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To get the solution, we are looking for, we need to point out what we know.

1. We assume, that the number 4.2E+14 is 100% - because it's the output value of the task.
2. We assume, that x is the value we are looking for.
3. If 4.2E+14 is 100%, so we can write it down as 4.2E+14=100%.
4. We know, that x is 30% of the output value, so we can write it down as x=30%.
5. Now we have two simple equations:
1) 4.2E+14=100%
2) x=30%
where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:
4.2E+14/x=100%/30%
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 30% of 4.2E+14

4.2E+14/x=100/30
(4.2E+14/x)*x=(100/30)*x       - we multiply both sides of the equation by x
4.2E+14=3.3333333333333*x       - we divide both sides of the equation by (3.3333333333333) to get x
4.2E+14/3.3333333333333=x
1.26E+14=x
x=1.26E+14

now we have:
30% of 4.2E+14=1.26E+14

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