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Let capacity of the tank = 18 litres (lcm of 6 and 9) Efficiency of pipe ‘A’ = (18/6) = 3 litres/hour Efficiency of pipe ‘B’ = (18/9) = 2 litres/hour Efficiency of all the three pipes together = (18/4.5) = 4 litres/hour Efficiency of pipe ‘C’ = 4 – (3 + 2) = (-1) litre/hour {Negative sign shows that pipe ‘C’ is an outlet pipe} Required time taken = {(2/3) × 18)}/1 = 12 hours
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A person, 'Q', uses 40% of their monthly income on food and then spends 60% of what is left on rent. After covering these expense...
I). p 2 – 5p – 126 = 0
II). q 2 + 9q – 90 = 0
Income of A is twice the income of B. B and A spend 55% and 65% respectively of their incomes. Find the savings of A, if B saves Rs. 18000 in a month.
28, 52, 84, 124, 172, ?.
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A triangle has sides 7 cm, 24 cm, and 25 cm. A circle is inscribed in the triangle. What is the area of the triangle not covered by the circle?