For the following questions answer them individually
The mean of 20 items is 55. If two items 45 and 30 are removed, the new mean of the remaining items is
Two pipes, P and Q can fill a cistern in 12 and 15 minutes respectively. If both are opened together and at the end of 3 minutes, the first is closed, how much longer will the cistern take to fill?
If there is a profit of 20% on the cost price, the percentage of profit on the sale price is
25% of 120 + 40% of 380 = ? of 637
A thief steals a car at 1.30 p.m. and drives it off at 40 km/hr. The theft is discovered at 2 p.m. and the owner sets off in another car at 50 km/hr. He will, overtake the thief at
In a ΔABC, AB = BC, ∠B = x° and ∠A = (2x- 20)°. Then ∠B is
ABC is an isosceles triangle and AB-AC and D is a point on AC so that BD-DC if <ABD=<CBD then the measure of <BAC
Three circles of radii 3.5 cm, 4.5 cm and 5.5 cm touch each other externally. Then the perimeter of the triangle formed by joining the centres of the circles, in cm, is
If secθ + tanθ = 5, then the value of the $$\frac{\tan\theta+1}{\tan\theta-1}$$
If $$tan^{2} θ = 1 - e^{2}$$ , then the value of $$secθ + tan^{3} θ cosecθ$$ is
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