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
The graphs of the equations 3x-20y-2=0 and 11x-5y +61=0 intersect at P(a,b). What is the value of (a² + b² − ab)/(a² − b²...
If x4 + x - 4 = 47 then find the value of (x + x-1).
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In a class of 70 students and 25 teachers, each student got gifts that were 20% of total number of students and each teacher got gifts that were 10% of ...
If cos(A - B) =√3/2and cot(A + B) = 1/√3, where A - B and A + B are acute angles, then (2A - 3B) is equal to:
1/3 + 1/15 + 1/35 + 1/63 + 1/99 = ?
(408 × 680)÷(20% of 680) = (250 × 260)÷ 10 + ? – 4500
