Respuesta :

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.
calculista

Let

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

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


we know that

[tex] x+y=28\\ x=28-y [/tex]

equation [tex] 1 [/tex]


[tex] x=3y [/tex]

equation [tex] 2 [/tex]

equate equation 1 and equation 2

so

[tex] 28-y=3y\\ 4y=28\\ y=7 [/tex]

[tex] x=3*7\\ x=21 [/tex]

therefore


the answer is

the number of Saris pencil erasers is [tex] 21 [/tex]

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