(a) Arif is 2x years old. His father is 4 times as old as he. His mother is 3 years younger than his father. What is their total age in terms of x?
(b) If x is = 4, find their total age.
Solution
(a)
Arif --> 2x
Father --> 4 x 2x = 8x
Mother --> 8x - 3
Total --> 2x + 8x + 8x - 3 = 18x - 3
Answer: (18x - 3) years
(b)
18(4) - 3
= 72 - 3
= 69
Answer: 69 years
Wednesday, February 17, 2010
Nanyang Pri Sch 2009 P6 CA1 Math Paper 2 Q6
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment