f = m+5
f+5 = 2m
m+5 + 5 = 2m
m = 5
Frank is 5 years older than Mary. In 5 years, Frank will be twice as old as Mary is now. How old is Mary now?
2 answers
Mary is currently 10.
Frank is 15.
In 5 years he'll be 20 which is twice as much/old as Mary's current 10.
F = M + 5 and M2 = F + 5
F - M = 5 and M2 - F = 5
(F - F) + (2M - M) = 10
M = 10
Frank is 15.
In 5 years he'll be 20 which is twice as much/old as Mary's current 10.
F = M + 5 and M2 = F + 5
F - M = 5 and M2 - F = 5
(F - F) + (2M - M) = 10
M = 10
1 answer