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primary 5 | Maths | Fractions
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Thomas Eng
Thomas Eng

primary 5 chevron_right Maths chevron_right Fractions chevron_right Singapore

Trying hard to solve this Q, but really hard...

Date Posted: 4 years ago
Views: 1399

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Alexandra Low
Alexandra Low's answer
6 answers (Tutor Details)
1st
The answer should be that Jeff received $280
Thomas Eng
Thomas Eng
4 years ago
Certain steps are still confusing...
eg... why no. of units left = 4 - 27/7?
J
J
4 years ago
That is talking about at the end of the 9th day... There are 4 units at the start, and 27/7 units have been spent by the end of the 9th day


Alternatively,
Fraction of $ spent in the first 7th days
= 1 - 1/4
= 3/4

3/4 = 21/28 (multiply both denominator and numerator by 7)

You can see this as 21 units were spent in the first 7 days , and there are 28 units in total.

So in 1 day, $ used
= 21 units ÷ 7
= 3 units


After the 9th day,
Total amount spent = 9 x 3 units = 27 units

Amount left = 28 units - 27 units
= 1 unit

1 unit = $10

Total at first = 28 units
= 28 x $10
= $280

The trick here is to multiply both the denominator and numerator of the fraction by 7 so that when we divide by the 7 days, we get a whole number for the number of units.


The other tutor has the same concept, but in fractions. This method here is by visualising in units. Pick the one that is more easy to understand for exam answering.
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Zhining
Zhining's answer
26 answers (Tutor Details)
key to answering this type of qns is to :
1) find out amount (fraction) of money spent each day
2) fraction of money left then solve to find total sum of money given