Question

Daca a, b, x aparține N, 7a=3b si x supra 42 = a supra b. Aflați x.

Answer 1

7a=3b
42a=18b

x supra 42 = a supra b
x= 42a supra b
x= 18b supra b
x=18

Answer 2

7a = 3b = a/b = 3/7
X/42 = a/b = 3/7 =>
=> 7X = 42×3 => 7X= 126 => X = 126 : 7 =>
=> X = 18