Question
The average weight of 100 students in a class is 46 kg.
The average weights of boys and girls are 50 kg and 40 kg respectively. What is the difference between the number of boys and girls?Solution
Let the number of boys and girls be x and (100 - x) respectively. According to the question, Mean = {50x + 40(100 - x)}/100 ⇒ 46 = {50x + 40(100 - x)}/100 ⇒ 4600 = 50x + 4000 - 40x ⇒ 4600 - 4000 = 10x ⇒ x = 600/10 ⇒ x = 60 So, the number of boys is 60. Number of girls = 100 – x = 40 Required difference = 60 – 40 = 20
What is the average annual production of Crop C over the five years?
What is the mean of the following data given below:
3,7,9,5,11,13,8,12,15,12,4
What is the total number of female employees across all departments?
Kevin and Ben started a business with initial investments in the ratio of 4:5. After six months, Kevin increased his investment by 25%, and Ben increase...
A person has ₹5000. He invests 40% of it in scheme A at 8% per annum and the remaining in scheme B at 10% per annum. What is the total interest earned...
A triangle ABC is inscribed in a circle. The tangent at A meets the extended sides BC and AB at points P and Q, respectively.
If ∠ACB = 30° an...
How many 5-digit numbers can be formed using digits 1 to 5 without repetition such that the number is divisible by 5?
The equation∣ z-2i ∣ + ∣ z + 2i ∣ = 6 represents:
The derivative of y = eË£ · cos(x) isÂ
The main folder on a storage device is known as
Relevant for Exams:
