Question
P can do a piece of work in 20 days, Q can do the same
piece of work in 24 days while R can do it in 30 days. They started working together but after 4 days ‘P’ left the work and the remaining work was completed by Q and R together. Find in how many days will the work be completed?Solution
P – 20 days P – 6 unit Q – 24 days LCM = 120 Q – 5 unit R – 30 days R – 4 unit Work of all 3 per day is (6 + 5 + 4) – 15 units All worked for 4 days. So, 4 days work is 4 × 15 = 60 units Remaining work = 120 – 60 = 60 units That work done by Q and R their per day unit = (5 + 4) = 9 unit Remaining work done by Q and R is `60/9` days = `6 2/3` days
A sum is lent on compound interest for 2 years at 14% p.a. If the compound interest on the sum is Rs.4194.4, find the sum.
The difference between compound and simple interest on a sum of money for 2 years at 25% per annum is Rs. 880. The sum is:
The simple interest received on a certain sum is Rs. 1200 less than the sum invested. If the sum was invested at 20% p.a. for 4 years, then find the sim...
Rs. ’P’ invested at a rate of 10% p.a. compound interest (compounded annually) amounts to Rs. 7744 at the end of 2 years. Find the simple interest e...
Sunil invested Rs. ‘5x’ in scheme ‘A’ offering simple interest of 25% p.a. and reinvested the interest earned from scheme ‘A’ at the end of ...
- Rohit invests Rs. 7,500 on compound interest at 10% p.a. (compounded annually) for 2 years and Rs. 6,400 on simple interest at 12% p.a. for 4 years. Find t...
A man buys a laptop at Rs. 18,000. He pays Rs.6,000 at once and the rest after 18 months on which he is charging a simple interest at the rate of 15% p...
Rs. 10000 when invested at simple interest of r% p.a. amounts to Rs. 12000 in 24 months. If the same sum had been invested for 1 year at compound intere...
The difference between the compound interest compounded annually and simple interest of a sum at 6% p.a. for 2 years is Rs. 36. Find the sum.
A sum of Rs. 3100 is invested at simple interest for 2 years. If the rate interest for first year is 10% p.a. while 18% p.a. for second year, then find ...
Relevant for Exams:
