# SOLUTION: rizen is 5 years older than JB. Find their present ages if the product of Rizen's age 4 years from now and JB's age 5 years ago is 51

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 Question 89596: rizen is 5 years older than JB. Find their present ages if the product of Rizen's age 4 years from now and JB's age 5 years ago is 51Answer by stanbon(57246)   (Show Source): You can put this solution on YOUR website!rizen is 5 years older than JB. Find their present ages if the product of Rizen's age 4 years from now and JB's age 5 years ago is 51 -------------- NOW DATA: JB is "x" yrs old ; Rizen is "x+5" yrs old: ------------- 4 yrs from NOW and 5 years from NOW DATA: Jb will be "x+4" yrs old; Rizen will be "x+10" yrs old ------------- EQUATION: (x+4)(x+10) = 51 x^2+14x+40 = 51 x^2+14x-11 = 0 x=[-14+-sqrt(14^2-4*1*-11)]/2 x=[-14 +- sqrt(240)]/2 Positive answer: x = 0.75 (JB's age NOW) x+5 = 5.75 (Rizen's age NOW) ============== Cheers, stan H.