A) 3:х+1=2:5

To solve this proportion, we need to cross multiply and solve for x.

3 5 = 2 (x + 1)
15 = 2x + 2
13 = 2x
x = 13/2
x = 6.5

Therefore, the solution to the proportion 3:х + 1 = 2:5 is x = 6.5

B) х:0.2=5:7

To solve this proportion, we need to cross multiply and solve for x.

x 7 = 5 0.2
7x = 1
x = 1/7
x = 0.142857

Therefore, the solution to the proportion x:0.2 = 5:7 is x = 0.142857