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primary 5 | Maths
| Fractions
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May I check whether this answer is correct? Thank you in advance for your help.
Date Posted: 5 years ago
Views: 341
Nope, it's incorrect. conceptual error here.
Because they didn't start of with 5/7 and 4/5 of the same amount of money. They started with different amounts of money so the fractions will be different
Because they didn't start of with 5/7 and 4/5 of the same amount of money. They started with different amounts of money so the fractions will be different
May I know how then should I solve it? Grateful thanks in advance.
Fraction of $ that Mdm Tan had left
= 1 - 5/7 = 2/7
Fraction of $ that Mrs Lee had left
= 1 - 4/5 = 1/5
Since they had same amount of money left, we can say that they have the same units left. So we make the numerator the same.
1/5 = 2/10
From this we see that Mdm Tan has 7 units at first, and Mrs Lee has 10 units at first. And in the end, each had 2 units left.
Difference of their money at first = 10 units - 7 units = 3 units
3 units = $546
1 unit = $546 ÷ 3 = $182
$ that Mdm Tan had at first
= 7 units
= $182 x 7
= $1274
$ Mrs Lee had left
= 2 units
= $182 x 2
= $364
= 1 - 5/7 = 2/7
Fraction of $ that Mrs Lee had left
= 1 - 4/5 = 1/5
Since they had same amount of money left, we can say that they have the same units left. So we make the numerator the same.
1/5 = 2/10
From this we see that Mdm Tan has 7 units at first, and Mrs Lee has 10 units at first. And in the end, each had 2 units left.
Difference of their money at first = 10 units - 7 units = 3 units
3 units = $546
1 unit = $546 ÷ 3 = $182
$ that Mdm Tan had at first
= 7 units
= $182 x 7
= $1274
$ Mrs Lee had left
= 2 units
= $182 x 2
= $364
Thank you for your kind help!
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Hello, hope this model gives you a better picture.
Date Posted:
5 years ago
Thank you for helping!
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