Question
The average weight of 12 students in a dance class is 45
kg. If the weight of 3 instructors is also included, then the new average weight of each person (instructor + student) in the dance class becomes 50 kg. Find the average weight of the three instructors.Solution
ATQ, Let the average weight of the three instructors be 'x' kg. So, total weight of the three instructors = 3 × x = '3x' kg. ATQ: 45 × 12 + '3x' = 50 × (12 + 3) Or, 540 + 3x = 50 × 15 Or, 540 + 3x = 750 Or, 3x = 750 - 540 = 210 Or, x = 210 ÷ 3 = 70 Therefore, the average weight of the three instructors is 70 kg.
In a queue of travellers at the emigration counter facing north, Pankaj is 9th from the extreme left end and Puja is 17th from the extreme right end. If...
‘Stay Safe Online’ Campaign and ‘G20 Digital Innovation Alliance’ were launched on which date?
Consider the following statements:
(1) Freedom as to payment of taxes for the promotion of any particular religion is given in Article 30 of the ...
Amit has 7 friends whom he wishes to invite to a dinner. Out of his 7 friends, 1 or more may accept the invitation. In how many different ways can Amit...
The preamble of the Constitution of India guarantees justice. It means India allows its people
What is the length of the hypotenuse in an isosceles right-angled triangle if one of its equal sides measures 6√2 cm?
With reference to the World Environment Day, consider the following statements:
1. It was designated by the International Union for Conservatio...
Refer to the given number and symbol series and answer the question that follows. Counting to be done from left to right only.
(Left) 2 & % 4 6 @...
Which of the following is true about Recession?
In a food chain, which trophic level has highest energy level ?
Relevant for Exams:
