In the beginning of the year 2004, a person invests some amount in a bank. In the beginning of 2007, the accumulated interest is Rs. 10,000 and in the beginning of 2010, the accumulated interest becomes Rs. 25,000. The interest rate is compounded annually and the annual interest rate is fixed. The principal amount is:

If f(x² - 1) = x⁴ - 7x² + k₁ and f(x³ - 2) = x⁶ - 9x³ + k₂ then the value of (k₂ - k₁) is

The tax rates for various income slabs are given below. Income Slab (Rs.) | Tax rate ≤ 500 | Nil > 500 to ≤ 2000 | 5% > 2000 to ≤ 5000 | 10% > 5000 to < 10000 | 15% There are 15 persons working in an organization. Out of them, 3 to 5 persons are falling in each of the income slab…

Two diagonals of a parallelogram intersect each other at coordinates (17.5, 23.5). Two adjacent points of the parallelogram are (5.5, 7.5) and (13.5, 16). Find the lengths of the diagonals.

If a, b, c and d are four different positive integers selected from 1 to 25, then the highest possible value of [(a + b) + (c + d)] / [(a + b) + (c - d)] would be:

In the diagram below, CD = BF = 10 units and ∠CED = ∠BAF = 30°. What would be the area of triangle AED? (Note: Diagram below may not be proportional to scale.) (Figure: A at top, AD vertical with B and C on it; BF ⟂ AD at B; ED ⟂ AD at D; E, C, F collinear.) [Figure: see page 17…

An ascending series of numbers satisfies the following conditions: i. When divided by 3, 4, 5 or 6, the numbers leave a remainder of 2. ii. When divided by 11, the numbers leave no remainder. The 6th number in this series will be:

A circular road is constructed outside a square field. The perimeter of the square field is 200 ft. If the width of the road is 7√2 ft. and cost of construction is Rs. 100 per sq.ft. Find the lowest possible cost to construct 50% of the total road.

In an examination, two types of questions are asked: one mark questions and two marks questions. For each wrong answer, of one mark question, the deduction is 1/4 of a mark and for each wrong answer, of two marks question, the deduction is 1/3 of a mark. Moreover, 1/2 of a mark i…