Question 641651
let sandra is x yrs old
than her brother is x+6
her sister is x-2
& her mother is 3x
now her brother, sister, and mother's combined age is 64
so x+6+x-2+3x=64
or 6x=64-4=60
or x=10
so sandra is 10 yrs old,her brother is x+616, her sister is 8 & her mother is 30 yrs
ans