Question

Ajutooooor!!!!!!!!!!​

Answer 1

$a + b + c + d$

$a + b + c + d = 637$

$a - \frac{a}{13} = b - \frac{3b}{13} = c - \frac{3c}{13} = d - \frac{5d}{13}$

$13a - a = 13b - 3b = 13c - 3c = 13d - 5d$

$12a = 10b = 10c = 8d$

$6a = 5b = 5c = 4d$

$a + 2b + d = 637$

$10 \times 6a + 24 \times 5b + 15 \times 4d = 637 \times 60$

$245b = 38220$

$b = 156 \: cm$

$c = 156 \: cm$

$\frac{5b}{4} = d$

$\frac{5 \times 156}{4} = d$

$5 \times 39 = d$

$d = 195 \: cm$

$\frac{5b}{6} = a$

$\frac{5 \times 156}{6} = a$

$a = 5 \times 26$

$a = 130 \: cm$