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If α, β, γ and Δ are the roots of the polynominal equation (x2 - 3x + 4)(x2 + 2x + 5)= 0, then the quardratic equation whose roots are α + β + γ + Δ and αβγΔ is
Diameter of two circular plates are respectively 18cm and 80 cm. The diameter of the plate which has an area equal to the combined area of two given plates is
The average of runs of a cricket player of 10 innings was 32. How many runs must he make in his next innings so as to increase his average of runs by 4?
OABC is a rhombus whose vertices A, B and C lie on a circle with centre at O. If radius of circle is 10cm. The area of the rhombus
Diagonals of a rhombus are in the ratio 3:4 and its area is 2400 cm2. Side of the rhombus is
The equation x² + Kxy + y² - 5x - 7y + 6 = 0 represents a pair of st. lines, then K is
Find Compound Interest on Rs 15625 for 9 months at 16% p.a compounded quarterly.
A shopkeeper marks his goods 20% above the cost price but allows 30% discount for cash. His net loss is
If the magnitude of angle θ is three times that of the angle φ in the given figure, then ∠φ is equal to
The angle of elevation of the top of an incomplete tower at a point 40 m from its base is 45°,If the elevation of the completed tower at the same point is 60°,then the height through which the tower has been raised is
2 pipes A and B can fill a cistern in 20 minutes and 25 minutes respectively, Both are opened together but at the end of 5 minutes B is turned off. Total time taken to fill the cisten is
In ΔABC , if a , b , c , are in A.P . , then tan A/2 tan C/2 =