30% of a number when subtracted from 91, gives the number itself. Find the number.
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In an election between two candidates, one got 55% of total valid votes. 20% of the total votes were invalid. The total number of votes were 7500. How many valid votes did the other person get?
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2
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The marked price of an article is Rs 2400. It is sold at two successive discounts of 10% and 15%. What is the selling price (in Rs) of the article?
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3
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A fraction in reduced form is such that when it is squared and then its numerator is reduced by 33 1/3 % and denominator is reduced to 20%, its result is twice the original fraction. The sum of numerator and denominator is:
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4
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A man spends 35% of his income on food, 25% on children's education and 80% of the remaining on house rent. What percent of his income he is left with ?
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5
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The ratio 5 : 4 expressed as a percent equals :
Solution5 : 4 = 5/4 = ( (5/4) x 100 )% = 125%. |
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In a factory there are three types of machine M1, M2 and M3 which produces 25%, 35% and 40% of the total products respectively. M1, M2 and M3 produces 2%, 4% and 5% defective products, respectively. what is the percentage of non-defective products ?
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7
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The population of a town increases every year by 4%. If its present population is 50,000, then after 2 years it will be
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8
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The population of village is 1,00,000. The rate of increase is 10% per annum. Find the population at the start of the third year?
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9
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In a laboratory experiment, a sample of air which is a mixture of oxygen and water vapour is taken. Water vapour, contains hydrogen and oxygen gases. If air contains a total of 70% oxygen (including that contained in the water vapour) by weight while water vapour contains 16.66% of oxygen by weight, how many kilograms of water vapour is present in 1 kilogram of air?
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10
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An ore contains 25% of an alloy that has 90% iron. Other than this, in the remaining 75% of the ore, there is no iron. How many kilograms of the ore are needed to obtain 60 kg of pure iron?
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