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TOPIC: Pls help explain the working at the bold portion... p5

Pls help explain the working at the bold portion... p5 2 months 1 day ago #1

  • Serene Leong
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This question below is found in P5 Essential onsponge book , page 67 question no 4.

Jazreel spent some money on books and 4/7 of the remaining money on some boxes of crayons. Given that she was left with 2/5 of her original sum of money and the difference between the cost of the boxes of crayons and the cost of the books was $28, find the amount of money Jazreel was left in the end.

2/5 of total = 3u x 2 (6u)

1/5 of total = 6u / 2 = 3u

5/5 of total = 5x3u = 15u
B= 15u-14u = 1
.........

Kindly advise why the above bold part must be multiply by 2 at 3u? That is the only part I don’t understand. Pls help... thank you!!
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Pls help explain the working at the bold portion... p5 2 months 16 hours ago #2

  • Fibonacci
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Pls help explain the working at the bold portion... p5 2 months 12 hours ago #3

  • Serene Leong
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Thank you so much!!! I understand already. Appreciate your effort in drawing the model to help me understand as well!!! Really thank you so much!!
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