Math question-10 points!?

Question

mary is twice as old as her brother and half as old as her father. In 22 years, her brother will be half as old as his father. How old is Mary now?

Answer 1

she is 22

Answer 2

mary = m

father = f

brother = b

4b=2m=f

2(b+22)=(f+22)

so,

2b+44=f+22

22=f-2b=4b-2b=2b (sub f=4b)

therefore, b=11

mary is twice her brother's age: 11x2=22

22 years old.