45/n = 5/9 , n/124 = 12/31 nilai n berapa?

1.1
2.tak tauuuu....
n

1.) 45/n = 5/9
45 x 9 = n x 5
405 = 5n
n = 405/5 = 81

2.) n/124 = 12/31
n x 31 = 124 x 12
31n = 1488
n = 1488/31 = 48

semoga membantu:)