30 : (2 + 3) *3 =
6 * 3 =
18 cm (your answer)
longest part = 18 m
add the parts of the ratio 2 + 3 = 5
divide 30 by 5 to find the value of 1 part of the ratio
= 6 ← 1 part
2 parts = 2 × 6 = 12 m
3 parts = 3 × 6 = 18 m ← longest part
6.5m questions
8.6m answers