Question

calcula a+d plz ayudenme a resolver doy coronas​

Answer 1

RESOLUCIÓN:

$\frac{a}{3} = \frac{b}{8} = \frac{c}{12} = \frac{d}{15} = k$

Obtenemos valores:

$a = 3k$

$b = 8k$

$c = 12k$

$d = 15k$

Resolvemos:

$a \times b + c \times d = 459 \\ 3k \times 8k + 12k \times 15k = 459 \\ 24 {k}^{2} + 180 {k}^{2} = 459 \\ 204 {k}^{2} = 459 \\ {k}^{2} = \frac{459}{204} \\ {k}^{2} = \frac{9}{4} \\ k = \sqrt{ \frac{9}{4} } \\ k = \frac{3}{2}$

Hallamos lo que nos piden:

$a + d = 3k + 15k = 18k = 18 \times \frac{3}{2} = 27$

RESPUESTA:

$A) \: 27$