Question 22398
Mary = y
Her father = 4y
Her mother = 4y-7
y+4y+4y-7=101
9y-7=101
9y=108
y=12
So Mary's age is 12, her father would be 4(12)=48, 
Her maother would be 4(12)-7=48-7=41
Hope you understand
=)