Answer:

Erika's age: 17

Patricia's Age: 3

Step-by-step explanation:

from the given Erika is older than Patricia

Let Erika be x(9)

Let Patricia be x

x+__=20

x(9)+x=20

10x=20

10x/10=20/10

x=2

Remember:

One year from now (Erika)

One year ago (Patricia)

Finding heir age NOW

x(9)-1 ERIKA

x-1 PARTICIA

Erika's age: 17

Patricia's Age: 3

17+3=20

Sorry pag chineck at mali, medyo nalito ako noong una to be honest haha