Answer:
40%
Step-by-step explanation:
10% of 40 is 4
4x4=16 meaning that 10% x 4 = 40%
I dont know how to really explain it I just solved it using calculator
If Father is four times older than Mary, that would be 4 times 10-- which equals 40. Five years ago, Mary must have been 5 years old. So, multiply 7 and 5 and you'll get 35! Father would have been 35 years old.
I hope this helps!
