If the given value is 16a + 16b = 48. What is the average of a and b?
Correct answer is: D. The average is ( a + b ) / 2 = 3/2
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A man spends Rs. 3500 per month and save 12 ½% of his income. His monthly income is?
Correct answer is: A.
If an alloy contains copper and silver in the ratio 3:7, then the percentage quantity of silver in the alloy is:
Correct answer is: B. (B) 70%
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A mixture contains 12% copper. How many kg of mixture is required to get 69 kg of copper?
Correct answer is: B. (B) 575 kg
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Two numbers are respectively 20% and 50% more than a third number. These two numbers are in the ratio:
Correct answer is: B. (B) 2:5
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Factorization of the expression y^2 + y-6 is?
- (y+2)(y-3)
- (y+3)(y-2)
- (y+3)(x-4)
- None
Explanation
To factorize the expression y^2 + y – 6, we need to find two numbers whose product is -6 and whose sum is 1 (the coefficient of the middle term).
These numbers are 3 and -2, so we can write:
y^2 + y – 6 = (y + 3)(y – 2)
The average of 6 numbers is 30. If the average of the first four is 25 and that of the last three is 35, the fifth number is:
Correct answer is: B. (B) 30
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