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Oxana [17]
3 years ago
14

3 brothers have 58 years in total. How old is the youngest brother if 3/4 of his age equals to 2/3 of middle brother's age and 3

/4 of youngest brother's age equals to half of oldest brother's age?​
Mathematics
1 answer:
matrenka [14]3 years ago
4 0

Step-by-step explanation:

Let O represents older brother

M represents middle brother

& Y represents younger brother.

Therefore, according to the given condition:

\frac{3}{4} y =  \frac{2}{3} m =  \frac{1}{2} o \\  \\  \therefore \:  \frac{3}{4} y =  \frac{2}{3} m \\  \implies \: m = \frac{3}{2}  \times  \frac{3}{4} y  =  \frac{9}{8} y \\  \\  next \:  \: \frac{3}{4} y =  \frac{1}{2} o \\ \implies \: o = \frac{2}{1}  \times  \frac{3}{4} y  =  \frac{3}{2} y  \\  \\  \because \: o + m + y = 58 \\ \\   \therefore \:  \frac{3}{2} y  + \frac{9}{8} y  + y = 58 \\  \\  \therefore \:  \frac{12}{8} y  + \frac{9}{8} y  +  \frac{8}{8} y = 58  \\  \\ \therefore \:  \frac{29}{8} y   = 58 \\  \\ \therefore \:  y   = 58  \times  \frac{8}{29} \\  \\  \therefore \:  y   = 2 \times 8  \\  \\ \therefore \:  y   = 16 \: years

Thus youngest brother is 16 years old.

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