Shortcut of Calendar and Clocks

Shortcut 87:                              Using the odd days Question: Find the day of birth of MS Dhoni (7 July, 1981), if 31 Dec 1999 is Friday Answer: Days after 7/7/1981 in 1981 = 177 Odd days by normal...

Shortcut of Heights and Distances

Shortcut 85: Using tanƟ Ɵ                                tan 0                                    0 30                            1/sqrt3 45                                  1 60                             sqrt3 90                              infty Question: A man on a boat saw a tower of...

Shortcut of LCM and HCF

Shortcut 82: Maximum number of items per group     Take HCF Question: There are 40, 45 and 50 balls in three different colors. They have to be arranged in boxes such that all the boxes...

Shortcut of Number system

Shortcut 77: Divisibility test Divisibleby                                    Rule 2                            Last digit of a number should be 0,2,4,6, or 8 3                            Sum of the digit should be divisible by 3 4                            Last two digits of a number should be...

Shortcut of Simple and Compound Interest

Shortcut 75: Simple interest SI=frac{PNR}{100} P = Principle amount invested or borrowed R = Rate of interest per term N = Number of terms Term = duration for which interest is calculated Question: A man invested Rs. 10000 at...

Shortcut of Pipes and Cisterns

Shortcut 73: One pipe fills and another empties frac{AB}{-A+B} Question: Pipe A can fill a tank in 4 hours and pipe B can empty the tank in 5 hours. If both pipes are opened together,...

Shortcut of Time and work-3

Shortcut 68: Three men working together frac{ABC}{AB+BC+AC} Question: A can do a work in 40 days, B in 50 days and C in 60 days. If they work together, how long will they take...

Shortcut of Time and work-2

Shortcut 65: Time, Work and Resource frac{W_1}{W_2}=frac{R_1T_1}{R_2T_2} Question: If 10 men can cut 40 trees in 4 days, how many trees can be cut by 40 men 6 days? Answer: R1 = 10; R2 = 40 T1...

Shortcut of Time and work-1

Shortcut 62: Time taken is directly proportional to work. frac{W_1}{W_2}=frac{T_1}{T_2} Question: It took 40 days to build 10 buildings. How long will it take to build 50 buildings using same number of employees? Answer: W1 =...

Shortcut of Boats

Boats Shortcut 59: Time taken upstream     T=frac D{S_b-S_r} Question: The speed of boat in still water is 40kmph. How long will the boat take to row 175 km upstream in a river of speed...

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