1.) A : B = 5 : 3
20 : B = 5 : 3
20/B = 5/3
5B = 20 x 3
5B = 60
B = 60/5
B = 12
2.) A : B = 5 : 3
A/18 = 5/3
3A = 18 x 5
3A = 90
A = 90/3
A = 30
3.) A : B = 2 : 5
42/B = 2/5
2B = 42 x 5
2B = 210
B = 210/2
B = 105
4.) P : Q = 3 : 7
P/49 = 3/7
7P = 49 x 3
P = 147/7
P = 21
5.) K : L = 4 : 5
K/50 = 4/5
5K = 50 x 4
K = 200/5
K = 40
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1.) A : B = 5 : 3
20 : B = 5 : 3
20/B = 5/3
5B = 20 x 3
5B = 60
B = 60/5
B = 12
2.) A : B = 5 : 3
A/18 = 5/3
3A = 18 x 5
3A = 90
A = 90/3
A = 30
3.) A : B = 2 : 5
42/B = 2/5
2B = 42 x 5
2B = 210
B = 210/2
B = 105
4.) P : Q = 3 : 7
P/49 = 3/7
7P = 49 x 3
P = 147/7
P = 21
5.) K : L = 4 : 5
K/50 = 4/5
5K = 50 x 4
K = 200/5
K = 40