Nora had a ribbon of 280 cm long. She tied some balloons on the ribbon. Part of the ribbon and balloons were shown. Each balloon was 15 cm apart from one another.
- What is the length of the ribbon between the third and the ninth balloon?
- Find the most number of balloons that could be tied on the 280 cm of ribbon with balloons at 15 cm apart from one another.
(a)
Number of intervals between the third and the ninth balloon
= 9 - 3
= 6
Length of the ribbon between the third and the ninth balloon
= 6 x 15
= 90 cm
(b)
Sets of 15 cm
= 280 ÷ 15
= 18 r 10
Most number of balloons
= 18 + 1
= 19
Answer(s): (a) 90 cm; (b) 19