In a classroom there are 15 boys and 13 girls. Average age of each boy and each girl is 21 years and 17 years respectively. The sum of ages of all the boys, girls and a teacher whose age is ‘x’ years is 570 years. Find the value of ‘x’.
Sum of ages of all boys = 15 x 21 = 315 Sum of ages of all girls = 13 x 17 = 221 So, 315 + 221 + x = 570 => x = 34
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