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Let presant age of raju be = x before 5 years,raje age = x-5 later 10 year,Raju age will be= X+10 According to situation (X-5)(X+10)=16 x^2+10x-5x-50=16 x^2 +5x-66=0 x^2+11x-6x-66=0 x(x+11)-6(x+11)=0 (x+11)(x-6)=0 x=-11,6 We neglect x=-11 ,because age never be negative Hence Raju age at present will be 6 year

Let Raju's age 5yrs ago be = x 10yrs letter his age will be= x+5+10 = x+15 As per question x(x+15)=16 ⇒ x²+15x-16=0 ⇒ x² +16x -x-16 =0 ⇒ x(x+16) -(x+16)=0 ⇒ (x+16)(x-1)=0 ⇒ x= -16 or 1 we neglect -16 Hence x=1 Raju's present age= x+5=1+5=6