Question
A sum of money becomes three times itself in 12 years at
simple interest. What is the rate of interest?Solution
Let the principal amount = Rs. P And rate of simple interest = R% p.a. After 12 years, it becomes Rs. ‘3P’ So, simple interest earned = 3P – P = Rs. 2P So, R = (100 × 2P)/(P × 12) = 200/12 = 16(2/3)%
Find minimum of x + 9/x for x>0.
If logₓ(81) = 4/3, find x.
A cone has a height of 12 cm and a base radius of 5 cm. A sphere with the same volume as the cone is constructed. What is the radius of the sphere?
Evaluate: {0.808 of 7500 - 80 × (1.458 + 2.242)}
The cost price ratio of the item 'watch' to the item 'ring' is 3:2, while the cost price ratio of the item 'ring' to the item 'ke...
The average of 20 numbers is 62. If 3 is added to each number, then the new average will be:
Find the smallest number that is divisible by 4, 6, 10, and 13.
A car travels 60 km at a speed of 30 km/hr, then 90 km at a speed of 45 km/hr, and finally 80 km at a speed of 40 km/hr. Find the average speed of the c...
If the geometric mean of 4, 18, and (p + 4) is 12, what is the value of '0.4p'?
