Ben Looi's answer to .'s Primary 4 Maths question.
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Hi. Forgive the ugly drawing. Using my phone. Anyway, draw a model of three parts, the green and blue are equal number of units, the red is the 11 units of $5.
So total value of the 2 and 5 notes of equal number of units is
$300 - the red $5x11. = $245
Now, the green and blue number of notes is $245. Visualise a stack of notes, all $5 and $2. You want to pao Ang Pow for new year,
so each packet will have 1x$5, and 1x$2. So each Ang pow is $2+$5 or $7. So you divide $245 by $7 and you get 35!
Therefore she got 35 $2 notes and 35+11 or 46 $5 notes.
Do a check.
35x2 + 46x5=300.
So total value of the 2 and 5 notes of equal number of units is
$300 - the red $5x11. = $245
Now, the green and blue number of notes is $245. Visualise a stack of notes, all $5 and $2. You want to pao Ang Pow for new year,
so each packet will have 1x$5, and 1x$2. So each Ang pow is $2+$5 or $7. So you divide $245 by $7 and you get 35!
Therefore she got 35 $2 notes and 35+11 or 46 $5 notes.
Do a check.
35x2 + 46x5=300.
Date Posted:
6 years ago
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