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Given:
[tex]\[
\frac{a+c}{b} = \frac{3}{2}, \quad \frac{b}{c} = \frac{3}{4}
\][/tex]

Find [tex]\(\frac{a}{b}\)[/tex].


Sagot :

Certainly! Let's solve the given equations step-by-step to find [tex]\(\frac{a}{b}\)[/tex].

Given:
1. [tex]\(\frac{a+c}{b} = \frac{3}{2}\)[/tex]
2. [tex]\(\frac{b}{c} = \frac{3}{4}\)[/tex]

First, let's deal with the second equation to express [tex]\(c\)[/tex] in terms of [tex]\(b\)[/tex]:
[tex]\[ \frac{b}{c} = \frac{3}{4} \][/tex]
This implies:
[tex]\[ b = \frac{3}{4}c \][/tex]
To solve for [tex]\(c\)[/tex]:
[tex]\[ c = \frac{4}{3}b \][/tex]

Now, substitute [tex]\(c = \frac{4}{3}b\)[/tex] into the first equation:
[tex]\[ \frac{a + c}{b} = \frac{3}{2} \][/tex]
[tex]\[ \frac{a + \frac{4}{3}b}{b} = \frac{3}{2} \][/tex]

We can split this fraction:
[tex]\[ \frac{a}{b} + \frac{\frac{4}{3}b}{b} = \frac{3}{2} \][/tex]
[tex]\[ \frac{a}{b} + \frac{4}{3} = \frac{3}{2} \][/tex]

Subtract [tex]\(\frac{4}{3}\)[/tex] from both sides:
[tex]\[ \frac{a}{b} = \frac{3}{2} - \frac{4}{3} \][/tex]

To subtract these fractions, we need a common denominator. The common denominator of 2 and 3 is 6:
[tex]\[ \frac{3}{2} = \frac{9}{6} \][/tex]
[tex]\[ \frac{4}{3} = \frac{8}{6} \][/tex]

Now, subtract the fractions:
[tex]\[ \frac{a}{b} = \frac{9}{6} - \frac{8}{6} = \frac{1}{6} \][/tex]

Thus, the ratio [tex]\(\frac{a}{b}\)[/tex] is:
[tex]\[ \frac{a}{b} = \boxed{\frac{1}{6}} \][/tex]