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primary 6 | Maths | Data Analysis
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Anugerah
Anugerah

primary 6 chevron_right Maths chevron_right Data analysis chevron_right Singapore

Assist pls

Date Posted: 3 years ago
Views: 182

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Lowest Common Multiple of 2,3,5 is 30.
All 3 lights will blink together every 30minutes.

First time they blink together is 7pm.
They will blink together again at 7.30pm, 8pm, 8.30pm, 9pm, 9.30pm, 10pm, 10.30pm, 11pm.

The question asks how many times they will blink together between 7.15pm and 10.50pm.

By counting we see that the answer is 7
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Soong Rui Kai
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