Answer: Colonel Horseradish has 10 candlesticks.
Explanation:
Let x represent the number of candle sticks that Colonel Horseradish has.
Mr. Brown has 10 more than two
thirds of the number of candlesticks that Colonel Horseradish has. It means that the number of candlesticks that Mr Brown has is
2x/3 + 10- - - - - - - - -1
Miss Lavender has three times as many as Mrs. Gray, who has 20 fewer than Colonel Horseradish has. The number of candlesticks that Mrs. Gray has is
(2x/3 + 10) - 20 = 2x/3 - 10
It means that the number of candlesticks that Miss Lavender has is
3(2x/3 - 10) = 2x - 10/3 - - - - - -2
If Mr. Brown and Miss Lavender actually have the same number of candlesticks, it means that
2x/3 + 10 = 2x - 10/3
Multiplying both sides of the equation by 3, it becomes
2x + 30 = 6x - 10
6x - 2x = 30 + 10
4x = 40
x = 40/4
x = 10