Let x be the brother's age now. Then the Kwame's age is 6x years. In 10 years 4*(x+10) = 6x + 10. Simplify and solve for x 4x + 40 = 6x + 10 40 - 10 = 6x - 4x 30 = 2x x = 30/2 = 15. ANSWER. Their present ages are 15 and 90 years. If you tell me that it is impossible, I will answer you that it may happen in parallel Universe.