1. A + 1 = 2(A - 5)
Solving, A = 11
2. 5(B - 1) = F - 1
4(B + 1) = F + 1
Solving, B = 7, F = 31
3. C = D - x
C - x = D - y (x years ago)
C - y = D/2 (y years ago)
C + D = 44
Solving, C = 20, D = 24, x = 4, y = 8
THIS MONTH'S QUIZ
1. A family has six members (including no twins, triplets, etc.) What is the probability that the two eldest members were both born on Fridays?
2. What is the probability that at least two members of the family were born on Fridays?
3. What is the probability that at least four of them were all born on the same day of the week (not necessarily Friday)?