Question

daca 7 supra x = y supra 3 , calculati 3xy-60

Answer 1

$\frac{7}{x}= \frac{y}{3} \\ 21=xy \\ 3xy-60=3*21-60=63-60=3$

Answer 2

7 / x = y / 3 = K
7 / x = K => x = 7 K
y / 3 = K => y = 3 K

3 x 7 K x 3 K - 60 = 
= 63 K - 60
= 3