Guide book J has 81 fewer pages than Guide book K, and Guide book L has 15 more pages than Guide book K. If Guide book J and Guide book K have a total of 159 pages,
- how many pages does Guide book K have?
- how many pages does Guide book L have?
(a)
Number of pages that Guide book J has = 1 u
Number of pages that Guide book K has = 1 u + 81
Number of pages that Guide book L has = 1 u + 81 + 15
Total number of pages that Guide book J and Guide book K have
= 1 u + 1 u + 81
= 2 u + 81
2 u + 81 = 159
2 u = 159 - 81
2 u = 78
1 u = 78 ÷ 2 = 39
Number of pages that Guide book K has
= 1 u + 81
= 39 + 81
= 120
(b)
Number of pages that Guide book L has
= 1 u + 81 + 15
= 120 + 15
= 135
Answer(s): (a) 120; (b) 135
