Let Rehman's present age =x yrs.3 yrs ago, Rehman's age =x−3 yrs5 yrs hence, his age will be x+5 yrs(x−3)1​+(x+5)1​=31​(x+5)(x−3)(x+5+x−3)​=31​x2+2x−15=6x+6x2−4x−21=0x2−7x+3x−21=0x(x−7)+3(x−7)=0(x+3)(x−7)=0x=−3,7Rehman's present age is 7 yrs.