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primary 5 | Maths
| Whole Numbers
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Hi anyone can help me on this question. . Thank u
Date Posted: 3 years ago
Views: 360
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Using Ratio to express the relation for Red, Blue and Yellow magnets.
The common item in the 2 sets of ratios is the total of Blue and Yellow magnets which is the reference for change the ratios to their equivalent for comparison.
The common item in the 2 sets of ratios is the total of Blue and Yellow magnets which is the reference for change the ratios to their equivalent for comparison.
Date Posted:
3 years ago
Thanks you i understand now ! Thank u so much
But wondering why both answer is difference
Hi Vk. There is one answer, 392, in my working. May I know which two answers are you referring to?
Fraction of beads that are blue and yellow = 1 - 4/7 = 3/7
There are 3 times as many blue as yellow beads.
Blue → 3 units, Yellow → 1 unit, total of Blue and Yellow → 4 units
Fraction of beads that are yellow = 3/7 × 1/4 = 3/28
Fraction of beads that are blue = 3/7 × 3/4 = 9/28
Fraction of beads that are red = 4/7 = 16/28
Difference in fraction of red and of yellow
= 16/28 - 3/28 = 13/28
Since there are 182 more red than yellow magnets,
13/28 of all magnets = 182
1/28 of all magnets = 182 ÷ 13 = 14
Total number of magnets = 28 × 14 = 392
There are 3 times as many blue as yellow beads.
Blue → 3 units, Yellow → 1 unit, total of Blue and Yellow → 4 units
Fraction of beads that are yellow = 3/7 × 1/4 = 3/28
Fraction of beads that are blue = 3/7 × 3/4 = 9/28
Fraction of beads that are red = 4/7 = 16/28
Difference in fraction of red and of yellow
= 16/28 - 3/28 = 13/28
Since there are 182 more red than yellow magnets,
13/28 of all magnets = 182
1/28 of all magnets = 182 ÷ 13 = 14
Total number of magnets = 28 × 14 = 392
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