J's answer to Vivi's Primary 5 Maths Whole Numbers Singapore question.
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Tuesday's amount = Monday's amount + $0.40
Wednesday's amount = Monday's amount + $0.40 + $0.40
Thursday's amount = Monday's amount + $0.40 + $0.40 + $0.40
Friday's amount = Monday's amount + $0.40 + $0.40 + $0.40 + $0.40
Total amount saved = 5 x Monday's amount + 10 x $0.40
= 5 x Monday's amount + $4
5 x Monday's amount + $4 = $12
So 5 x Monday's amount = $12 - $4 = $8
Monday's amount = $8 ÷ 5 = $1.60
So amount saved on Friday
= $1.60 + 4 x $0.40
= $1.60 + $1.60
= $3.20
Wednesday's amount = Monday's amount + $0.40 + $0.40
Thursday's amount = Monday's amount + $0.40 + $0.40 + $0.40
Friday's amount = Monday's amount + $0.40 + $0.40 + $0.40 + $0.40
Total amount saved = 5 x Monday's amount + 10 x $0.40
= 5 x Monday's amount + $4
5 x Monday's amount + $4 = $12
So 5 x Monday's amount = $12 - $4 = $8
Monday's amount = $8 ÷ 5 = $1.60
So amount saved on Friday
= $1.60 + 4 x $0.40
= $1.60 + $1.60
= $3.20
Date Posted:
4 years ago
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