Multiple choice

The HCF of two numbers is 21 and their difference is 63. Find the numbers.

  1. 42, 27

  2. 84, 21

  3. 82, 93

  4. 105, 165

  5. 63, 27
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let the numbers be 21a and 21b.

So, 21a - 21b = 63

a - b = 3

So, 4 - 1 = 3

So, the numbers are 84 (4 x 21) and 21 (1 x 21).

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