If an alloy contains copper and silver in the ratio 3:7, then the percentage quantity of silver in the alloy is:
(A) 90%
(B) 70%
(C) 60%
(D) None of these
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There were 600 students in a school. Each offered either English or Hindi or both. If 75% offered English and 45% Hindi, how many offered both?
(A) 48
(B) 60
(C) 120
(D) None of these
…A mixture contains 12% copper. How many kg of mixture is required to get 69 kg of copper?
(A) 424 kg
(B) 575 kg
(C) 828 kg
(D) None of these
The mean of 100 items was found to be 30. If at the time of calculation, two items were wrongly taken as 32 and 12 instead of 23 and 11, the correct mean is:
(A) 29.4
(B) 29.5
(C) 29.9
(D) None of these
Two numbers are respectively 20% and 50% more than a third number. These two numbers are in the ratio:
(A) 3:5
(B) 2:5
(C) 5:3
(D) None of these
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:
(A) 25
(B) 30
(C) 35
(D) None of these
Three candidates in an election received 1136, 7636, and 11628 votes respectively. What percentage of total votes did the winning candidate get?
(A) 57%
(B) 60%
(C) 76.4%
(D) None of these
…The 40th Prime Minister of New Zealand was:
(A) Eva Lawler
(B) Jacinda Ardern
(C) Julia Gillard
(D) None of these