Marion had a ribbon of 150 cm long. She tied some balloons on the ribbon. Part of the ribbon and balloons were shown. Each balloon was 20 cm apart from one another.
- What is the length of the ribbon between the second and the ninth balloon?
- Find the most number of balloons that could be tied on the 150 cm of ribbon with balloons at 20 cm apart from one another.
(a)
Number of intervals between the second and the ninth balloon
= 9 - 2
= 7
Length of the ribbon between the second and the ninth balloon
= 7 x 20
= 140 cm
(b)
Sets of 20 cm
= 150 ÷ 20
= 7 r 10
Most number of balloons
= 7 + 1
= 8
Answer(s): (a) 140 cm; (b) 8