# Whats wrong with this calculation?

• zak100
In summary, the conversation discusses a problem with evaluating a single variable equation and provides two different ways to solve it. The first attempt at solving the equation is incorrect due to a mistake in calculating 2400-1000, leading to an incorrect value for x. The second attempt uses a different method and results in the correct integer value for x.
zak100

## Homework Statement

Problem in evaluating a single variable equation

## Homework Equations

(10 + x)/ (40+x) * 100 = 60

## The Attempt at a Solution

(1)[/B]
(10 + x)/ (40+x) * 100 = 60
1000 + 100x = 2400 + 60x
100x -60 x = 2400-1000
40x = 2300
x= fractional value
(2)
However if i solve it using:
(10 + x) /(40 +x) = 60/100
(10 + x)/(40 + x) = 3/5
50 + 5x = 120 + 3x
2x= 70
x = 35 (integer value)
Some body please guide me what's wrong in my first calculation i.e. (1).

Zulfi.

What was 2400-1000 again?

zak100 said:

## Homework Statement

Problem in evaluating a single variable equation

## Homework Equations

(10 + x)/ (40+x) * 100 = 60

## The Attempt at a Solution

(1)[/B]
(10 + x)/ (40+x) * 100 = 60
1000 + 100x = 2400 + 60x
100x -60 x = 2400-1000
40x = 2300
2400 - 1000 is not equal to 2300.
zak100 said:
x= fractional value
(2)
However if i solve it using:
(10 + x) /(40 +x) = 60/100
(10 + x)/(40 + x) = 3/5
50 + 5x = 120 + 3x
2x= 70
x = 35 (integer value)
Some body please guide me what's wrong in my first calculation i.e. (1).

Zulfi.

Hi,
Thanks for solving this burden.

Zulfi.

## 1. What is the purpose of this calculation?

The purpose of this calculation is to determine the correct solution to a problem or question by using mathematical equations and principles.

## 2. How do I know if my calculation is correct?

To ensure the accuracy of your calculation, it is important to double check your work and use reliable sources for any numerical values or formulas. It is also helpful to have another person review your work for any potential errors.

## 3. Why does my calculation not match the expected result?

There are a few possible reasons why your calculation may not match the expected result. It could be due to a mistake in the formula or numerical input, or it could be a result of rounding errors. It is important to carefully review your work and make sure all inputs are correct.

## 4. What should I do if I get a different answer than my colleague?

If you and your colleague get different answers, it is important to go back and review your work together. Check for any differences in input values or formulas used. It is also helpful to consult reliable sources or seek guidance from a supervisor or mentor.

## 5. How can I improve my calculation skills?

To improve your calculation skills, it is important to practice regularly and review any mistakes or errors made. It can also be helpful to seek guidance from experienced colleagues or attend workshops and courses on mathematical and scientific calculations.

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