Discussion
A pole is 90 m long. It is colored in white, black and blue in the ratio of 5: 6: 7. What is the length of the white part of the pole?
Answer: D
The white part is 25 m long.
The ratio 5 : 6 : 7 has \(5 + 6 + 7 = 18\) parts in all, so
\[ \text{white} = \frac{5}{18} \times 90 = 25\ \text{m} \]
The black part is 30 m and the blue 35 m, which together with 25 m make 90 m. 30 m is the black part, the usual slip, and 15 m and 20 m do not follow from the ratio.
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