1.  A boy was asked to write the value of (2)^5*(9)^2. He wrote it as 2592. The difference between the obtained and the actual value is?


zero
2*9^2
2^2*9^3
2^3*9^4


Answer

 Option

2^5* 9^2 = 32*81 = 2592

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2.  If a*b *c means a+b/c for all numbers expect 0, then (a*b*c) *a*bis equal to:


zero
1
a+b+c/ab
a+b+ac/bc


Answer

 Option

(a*b*c)*a*b = (a+b/c)*a*b = (a+b/c)+a/b = a+b+ac/bc

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3.  If x is a positive number, then which of the following fractions has the greatest value?


x/x
x/x+1
x+1/x
x+2/x+3


Answer

 Option

clearly, x+1/x is the only fraction in which the numerator is greater than the denominator. So, it is the greatest fraction.

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4.  If 4/5 of an estate be worth Rs. 16,800, then the value of 3/7 of the estate is:


Rs.9000
Rs.21,000
Rs.72,000
Rs.90,000


Answer

 Option

Let the value of the estate be Rs. x. Then, 4/5 of x = 16800 <=> x = (16800*5)/4 = 21000 <=> 3/7 x = (3/7*21000) =9000.

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5.  By how much is three-fifth of 350 greater than four-seventh of 210?


95
110
120
None of these


Answer

 Option

3/5 of 350 - 4/7 of 210 = 210 - 120 = 90.

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