SOLUTION TO LAST MONTH'S QUIZ
1. 14 yr.
2. 34.2 m
3. 212
Notes
1. Let a = Mr. Jones' age, b = Mrs. Jones' age, m = years married.
b = 6/7 a So 7b = 6a
b + 7 = 7/8 (a + 7) So 8b + 56 = 7a + 49
Solving, a = 49, b = 42
So 42  m = 4/5 (49  m)
Solving, m = 14
2. Let x cm = spacing, n = no. of posts, l cm = length of fence.
So l = (n  1)x
l = (n  2)(x + 10)
l = n(x  9)
Solving, n = 20, x = 180, l = 3420
3. By intelligent trial and error:
Andy: Guess = 236: Error = 24
Beatrice: Guess = 200: Error = 12
Charlie: Guess = 220: Error = 8
