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Question

Find the value of $x$.

$6(8 x+25)-70=5(8 x+25)$

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
$x=5 \frac{5}{8}$

Equation Solution

The problem requires finding the value of $x$ from the given equation:

$6(8 x+25)-70=5(8 x+25)$

Simplifying the Equation

To make the equation easier to solve, let $y = 8x + 25$. Substituting $y$ into the equation gives:

$6y - 70 = 5y$

Solving for y

Rearrange the equation to solve for $y$:

  • Subtract $5y$ from both sides: $6y - 5y - 70 = 0$
  • Add $70$ to both sides: $y = 70$

Solving for x

Now substitute $8x + 25$ back in for $y$:

$8x + 25 = 70$

Isolate the term with $x$:

  • Subtract $25$ from both sides: $8x = 70 - 25$
  • Calculate the difference: $8x = 45$

Finally, solve for $x$:

  • Divide both sides by $8$: $x = \frac{45}{8}$

Converting to Mixed Number

Convert the improper fraction $\frac{45}{8}$ to a mixed number:

Divide $45$ by $8$. The quotient is $5$ and the remainder is $5$.

Therefore, $x = 5 \frac{5}{8}$.

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Important Questions from Linear Equation in 1 Variable

  1. The sum of three fractions A, B, and C, A > B > C, is \(\frac{121}{60}\) . When C is divided by B, the resulting fraction is  \(\frac{9}{10}\) , which exceeds A by  \(\frac{3}{20}\) . What is the difference between B and C?

  2. 7 is added to a certain number and the sum is multiplied by 5. The product is then divided by 3 and 4 is subtracted from the quotient. If the result comes to 16, then what is the original number?

  3. If the measure of one angle of a right triangle is 30° more than the measure of the smallest angle, then the measure of the smallest angle is:

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