Zeph's age is a multiple of 7 this year. His age next year will be a multiple of 4. Zeph is more than 60 years old. What is Zeph's age this year?
Multiples of 7: 7, 14, 21, 28, 35, 42, 49, 56, 63
Multiples of 7 (+1): 8, 15, 22, 29, 36, 43, 50, 57, 64
Multiples of 4: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64
Common number = 64
Zeph's age this year
= 64 - 1
= 63
Answer(s): 63