Problema Solution
A grandmother says her grandson is two years older than her granddaughter and that together, they are at least 12 years old. How old are her grandson and granddaughter?
Answer provided by our tutors
let
s = the age of the grandson
d = the age of the granddaughter
grandmother says her grandson is two years older than her granddaughter
s = d + 2
together, they are at least 12 years old
s + d >=12
d +2 + d >=12
2d >= 12 - 2
2d >= 10
d >= 5
s >= 7
the grandson is at least 7 years old and the granddaughter is at least 5 years old.