. If the roots, x₁,and x₂, of the quadratic equation x² - 2x + c = 0 also satisfy the equation 7_x2 - 4_x1 = 47, then which of the following is true?

A man purchased 40 fruits; apples and oranges for Rs 17. Had he purchased as many as oranges as apples and as many apples as oranges, he would have paid Rs 15. Find the cost of one pair of an apple and an orange

A singles tennis tournament is held, in which 30 men participated. If a player is eliminated as soon as he loses a match, how many matches are required to determine the winner

P lent Rs.600 to Q for 2 years and Rs.150 to R for 4 years and received altogether from both Rs.90 as interest. Find the rate of interest, simple interest being calculated

For prime numbers p and q, p + q = 102 and p > q. What is the least possible value of p − q?

If a₁ = 1 and a_n+1 = 2a_n + 5, n = 1, 2 ...., then a₁₀₀ is equal to :

If x + y = 2, then the value of x⁴ + y⁴ – x³ y² – x² y³+16xy is equal to

Manzoor had two equations containing three variables each. If they were x + 2y + 5z = 33, 2x+ 3y + z = 27, then which of the following choice will help him get a unique solution for x, y and z?

The difference in the money between A and B is Rs.1450.C has money twice of B and difference in the money between A and C is Rs.700.So the amount with A is?

If l(s) = 3s² + 3s + 3, which of the following is equal to l(-3.5)?