Some lamp posts were located at an equal distance of 4 m apart from one another, starting from the beginning of the road.
- What was the distance between the first lamp post and the fifth lamp post?
- What was the distance between the fifth lamp post and the fourteenth lamp post?
- Given that the stretch of road was 700 m, how many lamp posts were there from the beginning to the end of the road?
(a)
Number of intervals between the first lamp post and the fifth lamp post
= 5 - 1
= 4
Distance between the first lamp post and the fifth lamp post
= 4 x 4
= 16 m
(b)
Number of intervals between the fifth lamp post and the fourteenth lamp post
= 14 - 5
= 9
Distance between the fifth lamp post and the fourteenth lamp post
= 9 x 4
= 36 m
(c)
Number of lamp posts for 700 m excluding the first lamp post
= 700 ÷ 4
= 175
Total number of lamp posts from the beginning to the end of the road
= 175 + 1
= 176
Answer(s): (a) 16 m; (b) 36 m; (c) 176