Question 1 :
Thirty of the fifty students who took an exam received a grade of 90% or greater. What percentage of those fifty students received a grade of less than 90%?
(A) 70 (B) 35 (C) 40 (D) 30 (E) 10
Solution :
Total number of students = 50
Number of students scored 90% or
more than 90% marks = 30
Percentage of students who score
more than 90% of marks = (30/50) ⋅ 100%
= 60%
So, 60% of students are scoring 90% or more than 90% of marks.
Hence 40% students are getting lesser than 90% marks.
Question 2 :
Let n be a number from -3 to 4 inclusive. What is the range of values of n2?
(A) -9 ≤ n2 ≤ 16 (B) 9 ≤ n2 ≤ 16 (C) 3 ≤ n2 ≤ 4
(D) 0 ≤ n2 ≤ 2 (E) 0 ≤ n2 ≤ 16
Solution :
n = -3 n2 = 9 |
n = -2 n2 = 4 |
n = -1 n2 = 1 |
n = 0 n2 = 0 |
n = 1 n2 = 1 |
n = 2 n2 = 4 |
n = 3 n2 = 9 |
n = 4 n2 = 16 |
The range of n2 lies between 9 to 16 (inclusive).
Question 3 :
A is 3 times C. B is 8 less than C. For what value of C does A = B?
(A) -4 (B) 0 (C) 1 (D) 2 (E) 5/2
Solution :
Given that :
A = 3 C
B = C - 8
A = B
3 C = C - 8
3C - C = -8
2C = -8
C = -4
Hence the answer is -4.
Question 4 :
In a class of 28 students, everyone likes math, English, or both. If 17 like math and 19 like English, how many like both?
(A) 2 (B) 8 (C) 16 (D) 20 (E) 28
Solution :
Number of students in a class = 28
Number of students who like math = 17
Number of students who like English = 19
Number of students who like at least one = 28
17 - x + x + 19 - x = 28
36 + x = 28
x = 28 - 36
x = 8
Hence the number of students who like both subject is 8.
Question 5 :
Let x = 32·53·74 and y = 23·3·52. What is the greatest common factor of and y?
(A) 2· 3 · 5 · 7 (B) 23 · 32 · 53 · 74 (C) 3 · 5
(D) 3 · 52 (E) 32·53
Solution :
x = 32·53·74 and y = 23·3·52
Common factors are 3 · 52.
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