AC Lim's answer to Sharon's Primary 5 Maths Whole Numbers Singapore question.
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Hi Sharon, your ideas is correct... since we don’t know hiw much they have at 1st... so let the number of days = u. Hope this helps
Date Posted:
4 years ago
Alternative method :
Since May spends $18 and John spends $24 a day,
$24 - $18 = $6
John spends $6 more a day than May.
So the difference between their amount of money increases by $6 each day.
Difference in their money in the end
is 4 times. Since May has 5 times as much as John, she has 4 times more than John.
= $15 x 4
= $60
Number of days spent to reach the difference of $60
= $60 ÷ $6
= 10
At first, May has 10 x $18 + $15 x 5
= $255
Since May spends $18 and John spends $24 a day,
$24 - $18 = $6
John spends $6 more a day than May.
So the difference between their amount of money increases by $6 each day.
Difference in their money in the end
is 4 times. Since May has 5 times as much as John, she has 4 times more than John.
= $15 x 4
= $60
Number of days spent to reach the difference of $60
= $60 ÷ $6
= 10
At first, May has 10 x $18 + $15 x 5
= $255
Yes. This is most accepted method for primary students.
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