Question 193743
"Dorothy is 6 years older than Ricardo." -----> d=r+6


"The product of their present ages is twice what the product of their ages was 6 years ago" ----> d*r=2(d-6)(r-6)



d*r=2(d-6)(r-6)


(r+6)*r=2(r+6-6)(r-6)


(r+6)*r=2r(r-6)


r+6=2(r-6)


r+6=2r-12


6+12=2r-r


18=r


r=18 ----> Ricardo is 18 yrs old



d=r+6=18+6=24 ----> Dorothy is 24 yrs old