In a classroom there are 11 boys and 9 girls. Average age of each boy and each girl is 18 years and 15 years respectively. The sum of ages of all the boys, girls and a teacher whose age is ‘x’ years is 380 years. Find the value of ‘x’.
Sum of ages of all boys = 11 x 18 = 198 Sum of ages of all girls = 9 x 15 = 135 So, 198 + 135 + x = 380 => x = 47
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