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Order quantities interchanged on delivery, bill rises by p%: ratio of original quantities

The same question, asked 4 times: 12 Sep 2025 S2*, 13 Sep 2025 S3*, 14 Sep 2025 S2*, 14 Sep 2025 S3. Every wording below, oldest first.

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  1. Question 1

    12 Sep 2025 S2

    58
    A company placed an order for 20 high-end laptops and some quantity of standard desktops. The price of a high-end laptop was 5 times that of a standard desktop. Due to a mistake, the number of laptops and desktops was interchanged in the delivery. This caused the total bill to increase by 80%80\%. What was the ratio of the number of high-end laptops to standard desktops in the original order?

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  2. Question 2

    13 Sep 2025 S3

    62
    A stationery supplier ordered 88 boxes of premium pens and some boxes of standard pens. The price of premium pens per box was twice that of standard pens. When the order was delivered, the number of boxes of premium and standard pens had been accidentally interchanged. This increased the total bill by 25%25\%. What was the ratio of the original number of boxes of premium pens to the original number of boxes of standard pens?

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  3. Question 3

    14 Sep 2025 S2

    62
    Rohan ordered 5 kg of premium coffee and some additional kilograms of ordinary coffee. The price of the premium coffee per kg was three times that of the ordinary coffee. When the order was delivered, it was found that the quantities of premium and ordinary coffee had been swapped. This change increased his bill by 40%40\%. Find the ratio of the original quantity of premium coffee to the original quantity of ordinary coffee.

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  4. Question 4

    14 Sep 2025 S3

    58
    A stationery shop ordered 6 dozen red pens and some additional dozen blue pens. The price of the red pens per dozen was three times that of the blue ones. When the order was delivered, it was found that the number of dozens of the two colours had been interchanged. This increased the bill by 40%40\%. Find the ratio of the number of dozens of red pens to the number of dozens of blue pens in the original order.

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