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Let time taken by R to finish work is – x hr, By Q is = 1.4x hr Therefore, R+S = (1.4x/3)hr So, by S alone work = [1/3/1.4x) – 1/x ] = 7x/8 hr Entire time taken by all together = (1.4x - 90)hr Therefore, 1/x + 1/1.4x + 8/7x = 1/1.4x-90 1.4x +1+1.6x/1.4x = 1/1.4x -90 5.6x -360 = 1.4x x = 600/7 Hence, time taken by S alone to complete 80% = 7/8 x 600/7 x 0.8 = 60 hrs
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Initially, a person spends 70% of his salary and saves the remaining 30%. If his salary increases by 20% and his savings remain unchanged, he finds hims...
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Out of the total population in a village 25% casted invalid votes and the winning candidate A received 14(2/7)% more votes than the losing candidate B....
A man spends 72% of his income. If his income increases by 28% and his expenditure increases by 25%, then what is the percentage increase or decrease in...
Ajay spent 36% of his monthly income on rent and 46% of the remaining on food and the rest amount is saved by him which is Rs. 2592, then find the month...
The population of a city is decreased by 20% in the first year and then increased by 30% in the second year. Find the population of the city at the end...
