1 /3=x/15
3*x = 15 *1
3x = 15
x = 15 : 3
x = 5
35/28=5/x
35 * x = 28 * 5
35x = 140
x = 140 : 35
x = 4
1 /3=x/15
3*x = 15 *1
3x = 15
x = 15 : 3
x = 5
35/28=5/x
35 * x = 28 * 5
35x = 140
x = 140 : 35
x = 4