Answer:
12
trust me it works i just took the test.
4/5x - 4/10 = 2/20...multiply everything by common denominator 20
16x - 8 = 2
16x = 2 + 8
16x = 10
x = 10/16 which reduces to 5/8 <=
The one in the top left corner is the answer
0.10x - 0.08x = 250 - 185
0.02x = 65
x = 3250
