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 fourth lamp post?
- What was the distance between the fourth lamp post and the eleventh lamp post?
- Given that the stretch of road was 900 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 fourth lamp post
= 4 - 1
= 3
Distance between the first lamp post and the fourth lamp post
= 3 x 4
= 12 m
(b)
Number of intervals between the fourth lamp post and the eleventh lamp post
= 11 - 4
= 7
Distance between the fourth lamp post and the eleventh lamp post
= 7 x 4
= 28 m
(c)
Number of lamp posts for 900 m excluding the first lamp post
= 900 ÷ 4
= 225
Total number of lamp posts from the beginning to the end of the road
= 225 + 1
= 226
Answer(s): (a) 12 m; (b) 28 m; (c) 226