For the following questions answer them individually
In what ratio must 25% of alcohol be mixed with 50% of alcohol to get a mixture of 40% strength alcohol ?
A man had 7 children. When their average age was 12 years, a child aged 6 years died. The average age of remaining six children is
The average marks obtained by 22 candidates in an examination are 45. The average marks of the first 10 candidates are 55 and those of the last eleven are 40. The number of marks obtained by the eleventh candidate is
A shop-keeper sold a sewing machine for 1,080 at a loss of 10%. At what price should he have sold it so as to gain 10% on it ?
Santa and Julie start walking from the same place in the opposite directions. If Julie walks at a speed of 2.5 km/hr and Santa at a speed of 2 km/hr, in how much time will they be 18 km apart ?
Two trains 125 metres and 115 metres in length, are running towards each other on parallel lines, one at the rate of 33 km/hr and the other at 39 km/ hr. How much time (in seconds) will they take to pass each other from the moment they meet ?
A sum of money at compound interest will amount to 650 at the end of the first year and 676 at the end of the second year. The amount of money is
The simplest form of the expression $$\frac{p^2-p}{2p^3+6p^2}+\frac{p^2-1}{p^2+3p}+\frac{p^2}{p+1}$$
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