AC Lim's answer to Jesmi ajith's Primary 5 Maths Rate & Ratio Singapore question.
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Let the room = 15u
Ivan : 3 days—-> 15u
1 day = 5u
Jill : 5 days —-> 15u
1 days = 3u
If both work together, 1 day paint = 5u+3u=8u
8u—>1day
15u= 15u/8u
= 1 7/8 days or 1.875 days.
Ivan : 3 days—-> 15u
1 day = 5u
Jill : 5 days —-> 15u
1 days = 3u
If both work together, 1 day paint = 5u+3u=8u
8u—>1day
15u= 15u/8u
= 1 7/8 days or 1.875 days.
Date Posted:
4 years ago
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