Question

the age of sara's father is thrice hers.the age of sara's brother is 4 years more than hers.find an expression,in terms of y,for the sum of their ages,where y represents sara's age.​

Answer 1

Answer :-

let the age of sara be y years

then, according to the Question (age of Sara's father is thrice hers)

• father's age = 3y years

and (age of Sara's brother is 4 years more than hers)

• brother's age = y + 4 years

so,

• age of Sara = y years
• age of Sara's father = 3y years
• age of Sara's brother = y + 4 years

then,

sum of their ages = Sara's age + father's age + brother's age

$\bold{: \implies y + 3y + y + 4} \\ \\ \bold{: \implies 5y + 4 } \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:$

hence, sum of their ages is 5y + 4