Question
The cost of 4 chairs and 3 tables is ₹2,100 and the
cost of 5 chairs and 2 tables is ₹1,750. Find the cost (in ₹) of a chair.Solution
Let x denote the cost of a chair and y denote the cost of a table. 4x + 3y = 2100... (1) and 5x + 2y = 1750...(2) On multiplying equation (1) by 2 and equation (2) by 3 to make the coefficients of y equal, we get. = 8x + 6y = 4200.... (3) = 15x+6y = 5250... (4) On subtracting equation (3) from (4), we get. 7x = 1050 x = 150
- Which of the following numbers is not a perfect square?
A lending library has a fixed charge for the first 7 days and an additional charge for each day thereafter. Sahil paid Rs . 215 for a book kept for 15 ...
- A number exceeds 40 times its reciprocal by 7/8. Determine the number.
Find the greatest 4‑digit number which is exactly divisible by 12, 15 and 20.
In a two digit positive number, the digit in the unit’s place is equal to the square of the digit in ten’s place, and the difference between...
- Find the median of the following observations:
120, 125, 115, 130, 140, 135, 145 - Find the smallest number that is divisible by 14, 28, and 42.
Determine the highest possible value of (x + y) if the number '3x725y4' is divisible by 12.
Find the least number to be added to 1500 to make it a perfect square.
If y = 5, then what is the value of 10y
