Need to write an equation for kims age is 4 times of her sister when you add kims age to her sisters age you get 60. how old is each sister

Let kims sister age be x

Kims age=4 times x= 4x

Kims age+Kims sister age=60

Hence,4x+x=60

4x+x=5x

5x=60

x=60/5

=12

Kims age=4x

=4*12=48

kims sisters age=x

=12

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