Question
Find the sum of the first 70 natural
numbers.Solution
Sum of first 'n' natural numbers = n(n + 1) ÷ 2
Required sum = 70 × (70 + 1) ÷ 2 = 70 × 71 ÷ 2 = 2485
A invested Rs. ‘x’ for 3 months, then added Rs. 400 for the next five months and exited. B invested Rs. ‘x’ for the remaining 4 months of the ye...
A, B and C hired a taxi for Rs. 650 and used it for 3, 4, 6 hours respectively. Hiring charges paid by B are:
M and N started a business by investing Rs.5000 and Rs.6000 respectively. After 6 months, M and N increased their investments by 40% and Rs.2000 respect...
P and Q can finish a project in 10 days, while Q and R can finish it in 12 days. If R's efficiency is 50% more than Q's, how long will it take for P to ...
‘P’ began a business by investing Rs. 24000. After (x + 2) months, ‘Q’ entered with Rs. 18000, and again after (x + 2) more months, ‘R’ join...
‘M’ and ‘N’ started a business by investing Rs. 6,000 and Rs. 9,000 respectively. ‘x’ months later, they admitted ‘O’ as a partner who ...
Ashish started a business by investing Rs. 6300. Few months later; Ramesh joined him by investing Rs. 8000 such that at the end of the year, the profit ...
‘M’ started a business with an investment of Rs. 5000. After 2 months ‘N’ joins the business with an investment of Rs. 2950. If the total profit...
A invests Rs. 20,000 for 6 months, B invests Rs. 15,000 for 8 months, C invests Rs. 25,000 for 4 months. Total profit = Rs. 17,000. Find B’s share.
In a business there are two partners ‘P’ and ‘Q’. ‘P’ started the business with the capital of Rs. 28000 and after 3 months ‘Q’ joined h...
