Answer Posted / abhinav pratap

sum = n(n+1)/2
so, sum of 1 to 40 = 40(40+1)/2 = 20*21 = 820

The speed of a motor boat in still water is 15 km/hr and the rate of current is 3 km/hr. What is the distance travelled downstream in 12 minutes?

1195

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2020201-565656=?

1306

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A hotel has 10 storeys. Which floor is above the floor below the floor, below the floor above the floor, below the floor above the fifth.

1845

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1200

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f(X)= 2X-1 + f(X-1) if X is not equal to zeroandiff(X=0)=0, Value of f(16)+f(15)-480

1289

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1179

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if a=2, b=3, c=6 Find the value of c/(a+b)-(a+b)/c

1163

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What is the total distance covered by Sachin if he covers 2/3 rd of the distance at 4 kmph and the remaining distance at 5 kmph in 1hr 24min?

1156

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Make a square by drawing only one line

1411

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Initially two cups of same volume are present with milk filled upto 3/5th and 4/5th of their volumes.Water is then filled. Then two mixtures are mixed. Find the ratio of water to milk in the mixture.

1913

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600 tennis players 4% ->wrist band on one wrist of remain 96%->25%->on both hands remain no of ---

1191

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There are Brown and Black cows. In five days four black cows and 3 brown cows give as mush as milk that four brown cows and 5 black cows give in four days. If the black cow gives 10 litres of milk per day, how many liters of milk the Brown cow will give in one day? (Numbers are not certain)

1305

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There are some houses in a street back to back. And they that house behind 10 were 23. How many houses in the street?

1132

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9/10 or 10/11 which is greater.

1397

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If the bus travels with 8 tyres(6 tyres running),travels a distance of 16000 km how much is the distance sustained by each tyre.

2424

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