39. The average age of a teacher and three
students is 20 years. If all the three
students are of same age and the
difference between the age of the
teacher and each student is 20 years,
Tthen what is the age of the teacher?
(a) 25 years
(b) 30 years
(c) 35 years 7
sf (d) 45 years
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(b) 35 years 7 is the answer I think.
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