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Using Heron’s formula: Semi-perimeter (s) = (13 + 14 + 15)/2 = 21 Area = √[s(s - a)(s - b)(s - c)] = √[21(21 - 13)(21 - 14)(21 - 15)] = √[21 × 8 × 7 × 6] = √7056 = 84 cm² Correct answer: a) 84 cm²
The cost of booking a bus consists of a fixed charge and a variable charge per seat. When 75 seats are booked, the average cost per seat is Rs. 36. How...
In an examination, the average marks obtained by the students is 75. After correcting the quantitative mistakes, the average of 100 students is reduced...
Average of four consecutive prime numbers R1, R2, R3, and R4 is (14 + x). If the average of R1 and R2 is (11 + x) and the average of R3 and R4 is (11 + ...
Virat Kohli's strike rate after facing 'b' balls is 120. In the subsequent 15 balls, he scores an additional 39 runs, leading to ...
The average age of three children is 21 years. If their ages are in the ratio 3:5:6. Find the age of the youngest child.
Average of 17 numbers is 81. If the average of the first six and last eight numbers is 91.5 and 71.5 respectively, and if the ninth number is 20% more t...
The average age of X, Y, and Z is 25 years, and the average age of X and Y was 19.5 years at the time of Z's birth. If X is now 30 years old, determine ...
Average run scored by a batsman in first ‘x’ matches is 20. In next 5 matches he scored runs with an average of 60 so that his overall average incre...
The average cost of three chairs is Rs.12000. The average cost decrease by 18% when one more chair is included. What is the cost price of the 4th
