Problema Solution
the sum of Dante, Maria, and Coopers age is 31. Dante is twice as old as Cooper. Maria is one year older than Dante. How old are Dante, Maria, and Cooper?
Answer provided by our tutors
let dante, maria and coopers age are d,m,c
d+m+c=31
d=2c
and
m=d+1=2c+1
thus replace
2c+1+2c+c=31
=> 5c=30
c=6
coopers age=6 , dante=2*6=12
and maria=12+1=13