Calculate the perimeter of a rectangle, given that a circle with an area of 308 cm² has a radius that matches the diagonal of a square. The ratio between the perimeter of the square and that of the rectangle is 7:18.
Let radius of circle is ‘r’ cm And, length of the side of square is ‘a’ cm So, 22/7 × r2 = 308 Or, r2 = 98 cm Or, r = 7√2 cm So, Length of diagonal of square = √2 × a = 7√2 So, a = 7 cm Perimeter of square = 7 × 4 = 28 Perimeter of rectangle = 18/7 × 28 = 72 cm Hence, option d.
In a group of three numbers first is double of second and half of third. The average of three numbers is 56. Find the difference between the first numb...
The denominator of a positive rational number is 4 more than its numerator. If the numerator is increased by 6 and the denominator is increased by 5, th...
In a question of division, if divisor is 2 times of remainder and quotient is 1/3rd of divisor, if remainder is least multiple of 3 and 5 bot...
The value of 
If 1.5x = 0.04y, then the value of 
A single reservoir supplies petrol to the whole city, and the reservoir is fed by a single pipeline filling the reservoir with a stream of uniform volum...
Five numbers are arranged in decreasing order. The average of the first four numbers is 60, and the average of the last four numbers is 55. What is the ...
Arvind's age after 19 years will be 67 years. Ravi is 4 years older than Arvind. The ratio of present ages of Samar and Ravi is 9:13. Find the age of Sa...
The ratio of two natural numbers 'x' and 'y' is 9:13, respectively. When 30 is added to 'x' and 15 is subtracted from 'y', the ratio of 'x' to 'y' becom...
Find the unit digit in (257)45 × (248)73.
