1) 6 : x = 36 : 306/x = 36/306/x = 6/5x = 5
2) 12 : 7 = 3 : x12/7 = 3/x12x = 21x = 21/12x = 7/4
3) 4.9 : 0.35 = x : 354.9/0.35 = x/3514 = x/35x = 14 * 35x = 490
4) x/21 = 9/14x = 21 * (9/14)x = 189/14x = 13.5
5) x/16 = 3/8x = 16 * (3/8)x = 6
6) 108/90 = 42/b108/90 = 42/b1.2 = 42/bb = 42/1.2b = 35
1) 6 : x = 36 : 30
6/x = 36/30
6/x = 6/5
x = 5
2) 12 : 7 = 3 : x
12/7 = 3/x
12x = 21
x = 21/12
x = 7/4
3) 4.9 : 0.35 = x : 35
4.9/0.35 = x/35
14 = x/35
x = 14 * 35
x = 490
4) x/21 = 9/14
x = 21 * (9/14)
x = 189/14
x = 13.5
5) x/16 = 3/8
x = 16 * (3/8)
x = 6
6) 108/90 = 42/b
108/90 = 42/b
1.2 = 42/b
b = 42/1.2
b = 35