Answered

Sari has 3 times as many pencil erasers as Sam. Together, they have 28 erasers. How many erasers does Sari have?



Answer :

she has 25 erasers.
28
- 3
-----
25
calculista

Let

x--------> amount of erasers that Sari has

y--------> amount of erasers that Sam has


we know that


[tex] x=3y [/tex]-------> equation [tex] 1 [/tex]

[tex] x+y=28 [/tex]-----> equation [tex] 2 [/tex]


Substitute equation [tex] 1 [/tex] in equation [tex] 2 [/tex]

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


find the value of x

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


therefore


the answer is

Sari has [tex] 21 [/tex] erasers


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