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Question
Find the reduced form of the ratio of the first quantity to second quantity.
7 minutes 20 seconds, 5 minutes 6 seconds
Solution
7 minutes 20 seconds = 7 minutes + 20 seconds = 7 × 60 + 20 = 420 + 20 = 440 seconds ...(1 minute = 60 seconds)
5 minutes 6 seconds = 5 minutes + 6 seconds = 5 × 60 + 6 = 300 + 6 = 306 seconds
∴ 7 minutes 20 seconds : 5 minutes 6 seconds
∴ 440 seconds : 306 seconds = `440/306`
= `(440 ÷ 2)/(306 ÷ 2)`
= `220/153`
= `220 : 153` ...(HCF of 220 and 153 = 2)
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