1.  If a*b = ab/a+b, find the value of 3*(3* - 1).


-3
- 1.5
-1
2/3


Answer

 Option

(3* -1) = 3* (-1)/3+(-1) = -3/2. So, 3*(3* -1) = 3*(-3/2) = 3*(-3/2)/3+(-3/2) = -9/2*2/3 = -3.

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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 1/3 + 1/2 + 1/x = 4, then x = ?


5/18
6/19
18/5
24/11


Answer

 Option

1/x =4 - (1/3 + 1/2) = 4 - ( 2 + 3)/6 = 4 - 5/6 = 24-5 /6 = 19/6 => x = 6/19.

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4.  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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5.  If a*b = 2a - 3b + ab, then 3*5 + 5*3 is equal to:


22
24
26
28


Answer

 Option

3*5+5*3 = (2*3 - 3*5 + 3*5) + (2*5 - 3*3 + 5*3) = (6+10 - 9 + 15) = 22.

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