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Work done by C in 1 day = 1/20 Work done by D in 1 day = 1/25 Work done by C and D together in 1 day = (1/20) + (1/25) Taking LCM of 20 and 25 = 100, Work done together = (5/100) + (4/100) = 9/100 Work done in 8 days = 8 × (9/100) = 72/100 = 18/25 Remaining work = 1 - 18/25 = 7/25 D’s work rate = 1/25 Time taken by D to finish = (7/25) ÷ (1/25) = 7 days. Correct Option: c) 7 days
If (p + 15)% of 240 is 30 more than the p% of 300, then find the value of 20% of (p + 10.5).
The total strength of school A is 20% more than that of school B. In school A and B, out of total number of students, 30% and 40% respectively are girls...
A man spends 25% and 11% of his monthly salary on rent and transportation, respectively. Out of the remaining money, he spends 28% on food and 43% on en...
A spent 30% and 22% of his monthly salary on food and rent, respectively. Of the remaining amount, he gave 20% and 40% to his mother and brother, respec...
The value of A’s car is depreciating by 45% every year whereas the value of his house is appreciating by 10% each year as compared to the previous yea...
Two numbers are less than a third number by 40% and 46% respectively. Find the percent by which the second number is less than the first.
Out of 520 students in school, 30% students like samosa only and 40% students like samosa and momos both. If 20% students don’t like any snacks then f...
Monthly income of A is Rs. 6500 and he saves 36% of his monthly income. If monthly expenditure of A is decreased by 35% while his monthly savings is inc...
Manmeet decided to donate 20% of her salary to an NGO. On the day of donation she changed her mind and donated Rs. 13520 which was 80% of what she decid...
In an election two candidates participates. 20% voters did not vote. 25% votes declared invalid and the winner get 80 % of the valid votes. If he win by...
