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primary 5 | Maths | Fractions
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PurpleOlive
PurpleOlive

primary 5 chevron_right Maths chevron_right Fractions chevron_right Singapore

May I check whether this answer is correct? Thank you in advance for your help.

Date Posted: 3 months ago
Views: 36
J
J
3 months ago
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
PurpleOlive
PurpleOlive
3 months ago
May I know how then should I solve it? Grateful thanks in advance.
J
J
3 months ago
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
PurpleOlive
PurpleOlive
3 months ago
Thank you for your kind help!

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Shirley
Shirley's answer
18 answers (Tutor Details)
1st
Hello, hope this model gives you a better picture.
PurpleOlive
PurpleOlive
3 months ago
Thank you for helping!