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Q. A boat is sent across a river with a velocity of 8 km/hr.If the resultant velocity of boat is 10 ,then velocity of river is - JAM-1994
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| Question |
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A quick way to square numbers that end in 5.
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| Answer |
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752 = 5625
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| Trick |
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752 means 75 x 75.
The answer is in two parts: 56 and 25.
The last part is always 25.
The first part is the first number, 7, multiplied
by the number "one more", which is 8:
so 7 x 8 = 56
752 = 5625
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