Question

sari has 3 times as many pencil erasers as sam. together, they have 28 erasers. he may erasers does sari have

Answer 1

Sari has 21 and Sam has 7 7x4=28 which is the total, so you just need to split it up so that you get 7 and 21 which is 3 times more than 7.

Answer 2

Let

x--------> the number of Saris pencil erasers

y--------> the number of Sams pencil erasers

we know that

`x+y=28\\ x=28-y`

equation
`1`

`x=3y`

equation
`2`

equate equation 1 and equation 2

so

`28-y=3y\\ 4y=28\\ y=7`

`x=3*7\\ x=21`

therefore

the answer is

the number of Saris pencil erasers is
`21`