Question
The average of five even numbers is 72. If we replace
two of these even numbers, 84 and 92, with a single even number X, the new average decreases by 4. What is the value of X?Solution
Sum of 5 even numbers = 5 x 72 = 360 Sum of after 2 replacing even numbers by X = 360 - (84 + 92) + X = 360 - 176 + X Now Sum of 4 even numbers = (72 - 4) x 4 = 272 According the question, we get 360 – 176 + X = 272 X = 272 – 360 + 176 X = 88
Abdul allocates 90% of his income among his wife, son, and daughter in the ratio of 5:2:1, while saving the remaining amount, which totals Rs. 4,000. Fr...
Ratio between two numbers is 7:12 and their difference is 60. Find the sum of the given two numbers.
If the third proportion of 30 and 45 is “0.5k”, then find the value of (k − 18) : (k + 22).
What number has to be added to each term of 5:6 to make the ratio 7:8?
The ratio of the monthly salary of Supriya to that of Mohini is 3 : 5. Supriya and Mohini both save 30% and 42% respectively of their monthly salaries r...
Rs. 23942 are divided between A and B in the ratio 3:7. What is the difference between thrice the share of A and twice the share of B?
A sum of Rs. 720 is divided among X, Y and Z such that X gets Rs. 124 more than Y. Y gets Rs. 64 more than Z. Find the share of Z?
The ratio of the number of English books to Hindi books in a library shelf is 4:3. If 90 Hindi books are written by Pradeep, which constitutes 30% of th...
Find the mean proportion of 81 and 324.
Three friends ‘A’, ‘B’ and ‘C’ rented a playground for a fixed fee per day. If they used the ground for 4 days, 5 days and 7 days, respecti...
Relevant for Exams:
