2015 · Q47
A number consists of two digits, whose sum is 7. If the digits are reversed, the number is increased by 27. The product of digits of the number is
Elementary MathematicsTrigonometry
- A6
- B8
- C10
- D12
Explanation
With digits a, b: a + b = 7 and 9(b - a) = 27 give b - a = 3, so a = 2, b = 5 and their product is 10. Hence option (c).