CA Foundation P3 · Chapter 1 · Question 1 of 9

Two numbers are in the ratio 5 : 8. If 9 is added to each number, the ratio becomes 2 : 3. The two numbers are:

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Reveal answer & explanation

Correct answer: B) 45 and 72

Explanation

Let the numbers be 5x and 8x. Then (5x + 9)/(8x + 9) = 2/3, so 15x + 27 = 16x + 18, giving x = 9. The numbers are 5 x 9 = 45 and 8 x 9 = 72. Check: 54/81 = 2/3. The option 54 and 81 gives the numbers after adding 9, not the original numbers.

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All 9 questions in Chapter 1Ratio and Proportion, Indices and Logarithms MCQs with answers

More Ratio and Proportion, Indices and Logarithms MCQs

Q3The fourth proportional to 4, 10 and 14 is:
Q4The mean proportional between 12 and 75 is:
Q5The value of (xᵃ/xᵇ)^(a+b) · (xᵇ/xᶜ)^(b+c) · (xᶜ/xᵃ)^(c+a) is:
Q6If 3ˣ = 5ʸ = 15ᶻ, then z equals:
Q7Given log 2 = 0.3010 and log 3 = 0.4771, the value of log 72 is:

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