math
posted by Kay .
Miriam is four years older than Ricardo. 10 years ago she was 3 times as old as Ricardo was then.
A) How old are they now
B) determine whether your answer is correct by checking that it satisfies the conditions of the problems

Ricardo  x
Miriam  x+4
10 years ago:
Ricardo  x10
Miriam  x+410 = x6
at that time she was 3 times as old as Ricardo
x6 = 3(x10
x6 = 3x  30
2x = 24
x = 12
Ricardo IS now 12
and Miriam is now 16
You check the answers to make sure the conditions fit.