Tricks of Time and Work problem

Tricks 1. If A can do a piece of work in x days and B can do the same work in y days then time taken by (A + B) to complete the work = xy / (x + y) days Q. A can do a piece of work in 10 days and B can do the same work in 12 days. How long will they take to finish the work, if both work together? Solution  Here x = 10, y = 12 Therefore...

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practice questions on Partnership

1.Srikant and Vividh started a business investing amounts of 185000 and 225000, respectively. If Vividh's share in the profit earned by them is 9000, what is the total profit earned by them together? [Bank Clerks 2009] Solution Ratio of profit = Ratio of investment Therefore Srikant's share : Vividh's share          ...

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Practice questions on Ages

1.The average age of 8 children of a family is 12 yr. If the age of 7 children are 12, 8, 14, 11, 9, 13 and 15 yr, then the age of 8th child will be [RRB 2008] Solution Since total age of 8 children =  8 × 12                                    ...

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Shortcut tricks of Problem on ages

Tricks 1.If ratio of present ages of A and B is x: y and n yr ago, the ratio of their ages was p : q then (x - n) /( y - n) = p/q Q. A father is twice as old as his son. 20 yr back, he was twelve times as old as his son. What is the present age of father? Solution Let the present age of father be 2k yr and that of son is k yr Then x = 2k and...

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Practice questions on Unitary method

1. If cost of 24 oranges is  72, then find out the cost of 120 oranges. [Bank Clerks 2009] Solution Given cost of 24 oranges = 72             Cost of 1  orange   = 72/24                                    ...

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Shortcut tricks of Compound Interest

Tricks Let principal =P Rate =R% Time=n years 1.If interest is compounded annually, then                Amount=P(1+R/100)^n Compound Interest= Amount –Principal Compound Interest= P[(1+R/100)^n - 1] 2.If the interest is compounded half-yearly ,then R=R/2       & n=2n then  ...

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Shortcut tricks of True discount and Banker's Discount

Tricks 1. If rate of interest is R% per annum, time is T yr and present worth is PW, then true discount (TD)                             = PW × R × T / 100 2. If rate of interest is R% and money due (for amount) is A after T yr. then            Present Worth (PW) =  100 × A / ( 100 + R × T) 3. If money due A, rate of interest R% and time...

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Computer awareness set - 4

1. Which is not an integral part of computer? [ SBI CLERK 2012]                        a. CPU.            b. Mouse                        c. Monitor.     d. UPS                        d. None of these Answer : d. UPS 2. Microprocessors...

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