Answer:
A = B
Step-by-step explanation:
Of means multiply and is means equals
50% *A = .5a
.5A = .5a
Divide by .5
.5A/.5 = .5a/.5
A =a
20% B = .2a
.2B = .2a
Divide by .2
.2B/.2 =.2a/.2
B=a
