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5. The denominator of a fraction is 3 more than the numerator. If 5 is added to both numerator and denominator, the fraction becomes [tex]\frac{4}{5}[/tex]. Find the fraction.

Sagot :

Certainly! Let's solve the problem step-by-step:

Given:
- The denominator of a fraction is 3 more than the numerator.
- If 5 is added to both the numerator and the denominator, the new fraction becomes [tex]\(\frac{4}{5}\)[/tex].

Let's denote the numerator of the fraction by [tex]\(x\)[/tex]. Consequently, the denominator will be [tex]\(x + 3\)[/tex].

So, initially, the fraction can be expressed as:
[tex]\[ \frac{x}{x + 3} \][/tex]

According to the given condition, if we add 5 to both the numerator and the denominator, the new fraction becomes [tex]\(\frac{4}{5}\)[/tex]. Thus, we have:
[tex]\[ \frac{x + 5}{x + 8} = \frac{4}{5} \][/tex]

To find [tex]\(x\)[/tex], we can cross-multiply to solve this equation:
[tex]\[ 5(x + 5) = 4(x + 8) \][/tex]

Let's solve for [tex]\(x\)[/tex] step-by-step:
[tex]\[ 5x + 25 = 4x + 32 \][/tex]

Subtract [tex]\(4x\)[/tex] from both sides:
[tex]\[ x + 25 = 32 \][/tex]

Next, subtract 25 from both sides:
[tex]\[ x = 7 \][/tex]

So, the numerator of the original fraction is [tex]\(x = 7\)[/tex].

Now, let's find the denominator:
[tex]\[ x + 3 = 7 + 3 = 10 \][/tex]

Therefore, the original fraction is:
[tex]\[ \frac{7}{10} \][/tex]

So, the fraction is [tex]\(\frac{7}{10}\)[/tex].