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Step-by-step explanation:
let the age of new student be y
let the average age of 12 students = x
total age of 12 student= x×12
total of age of 12 student= 12x
total age after leaving 1 student= 12x-15
total age after join new student = 12x-15+y
increase in average = 3months
new average = x+3/12
new average = x+1/4
total age of 12 student= 12(x+1/4)
total age of 12 student= 12x+3
a/q
12x+3= 12x-15+y
12x-12x+3+15=y
18=y
hence age of new student be 18
#666
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