Question
In a gathering of 30 guests, the average age of each
guest in the class is 21 years. Later, 4 more guests join the party, causing the average age of the entire party to decrease by 12 months. Determine the average age of the 4 guests who joined the class.Solution
ATQ, Initial sum of ages of the guest in the party = 21 × 30 = 630 years New average age of the guest = 21 - (12/12) = 21 - 1 = 20 years New sum of ages of the guest in the party = 20 × 34 = 680 years So, the sum of ages of the guest who joined the party = 680 - 630 = 50 years So, the required average = (50/4) = 12.5 years
In 2011, the total population of a village was 5280, Out of which 30% were female. In 2012, the total population increased by 10% in comparison to the p...
Partners A, B, and C invest Rs 10,000, Rs 15,000, and Rs 20,000 in a business. At the end of the year, the business generates a profit of Rs 45,000. A i...
Aryan, Bhavya, and Chetan initiated a venture with initial investments of Rs. 50,000, Rs. 60,000, and Rs. 72,000 respectively. After six months, Aryan, ...
Two numbers are less than a third number by 30% and 37%, respectively. By how much percent is the second number less than the first?
If the numerator of a fraction is increased by 16.66 % and denominator decreased by 14.28 % then, it becomes the reciprocal of itself. Find the original...
What is 25% of 320?
If 66.66% of ‘t’ equals 6 times 25% of ‘u’ and ‘t’ is 70% of 450, find the value of ‘u’.
The total strength of school A is 20% more than that of school B. In school A and B, out of total number of students, 20% and 50% respectively are girls...
A person "P" allocates 34% of their monthly income to entertainment, 22% to food, 18% to studies, 12% to clothes, and the remainder to traveling. The di...
The income of P is 2/5th of the income of Q and income of R is 60% more than the income of Q. Income of Q is Rs.30000 and expenditure of P is...
Relevant for Exams:
