Start learning 50% faster. Sign in now
ATQ,
Let the original usage be ‘x’ units and the price per unit be Rs. ‘y’.
Initial expenditure = Rs. xy
New increased price = Rs. 1.10y
Reduced usage = 0.95x
New expenditure = 1.10y × 0.95x = Rs. 1.045xy
Hence, the expenditure increases by 4.5%.
The average age of husband, wife and their child 4 years ago was 26 years and that of wife and the child 5 years ago was 25 years. The present age of th...
The average price of two books, namely 'X' and 'Y' is Rs. 850 whereas the average price of books 'Y' and 'Z' is Rs. 910. If the average price of book 'X...
Average 20 numbers is ‘x’. If the average of first 12 numbers is 64.5 while average of last 5 numbers is 84.8 and 13th, 14th...
There are three categories of jobs HR, CA and PA. The average salary of the student who got the job of HR and CA category is 20 lakhs per annum. The ave...
Average run scored by a batsman in first ‘x’ matches is 75. In next 13 matches he scored runs with an average of 90 so that his overa...
There are 15 numbers such that average of first 12 numbers is 65 while the average of last five numbers is 70. Find the 12th number, if the ratio betwee...
The average weight of a group of (x - 3) employees is (x + 4) kg. If a manager of weight 54 kg joins the office, then average weight of the group increa...
The average marks of 50 students in an examination was 65. It was later found that the marks of one student had been wrongly entered as 83 instead of 38...
Average of 20 numbers is 90. Average of first 8 numbers is 103 while average of last nine numbers is 40. If ninth number is 25% less than the tenth numb...