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Learn BANK PO MCQs with answers [Page 18 of Department 62]

R

Ravi Chauhan • 9.62K Points
Tutor III Math 

171) The sum of two numbers is equal to the thrice of their difference. What will be the ratio between them?

(A) 1 : 3
(B) 3 : 1
(C) 1 : 2
(D) 2 : 1
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Correct Answer - Option (D)

Explanation :
Let the numbers be 'a' and 'b'. According to the question - (a + b) = 3(a - b) (a + b) = 3a - 3b 2a = 4b a = 2b So, a/b = 2 : 1

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R

Ravi Chauhan • 9.62K Points
Tutor III Math 

173) The sum of four consecutive even numbers is 748, then which is the smallest number among them?

(A) 184
(B) 186
(C) 174
(D) None of the above
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Correct Answer - Option (A)

Explanation :
Let a be the smallest even number So, according to the question - (a) + (a + 2) + (a + 4) + (a + 6) = 748 4(a) + 12 = 748 4a = 736 Or, a = 184 So, the smallest number be 184

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R

Ravi Chauhan • 9.62K Points
Tutor III Math 

174) If (64)² - (36)²= 20 * x, then what is the value of x?

(A) 120
(B) 140
(C) 112
(D) None of the above
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Correct Answer - Option (B)

Explanation :
Here, we can apply the formula of a^2 - b^2 = (a + b) (a - b) So, after applying the formula, we will get (64 + 36) (64 - 36) = 20 * x 100 * 28 = 20 * x x = 100 * 28/ 20 = 140

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R

Ravi Chauhan • 9.62K Points
Tutor III Math 

175) What is the value of (a - b), if (a^2 - b^2)/(a + b) = 25?

(A) 36
(B) 22
(C) 45
(D) 25
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Correct Answer - Option (D)

Explanation :
According to the identity, a^2 - b^2 = (a + b) (a - b) It is given that (a^2 - b^2)/(a + b) = 25 So, it can be written as (a + b) (a - b)/(a + b) = 25 Hence, (a - b) = 25

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R

Ravi Chauhan • 9.62K Points
Tutor III Math 

176) What will be the result of 1397 x 1397?

(A) 1951609
(B) 1951608
(C) 1951699
(D) None of the above
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Correct Answer - Option (A)

Explanation :
Given 1397 x 1397 We can also write it as (1397)^2 Or, (1400 - 3)^2 On expanding we get, = (1400)^2 (3)^2 - (2 x 1400 x 3) = 1960000 9 - 8400 = 1960009 - 8400 = 1951609

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R

Ravi Chauhan • 9.62K Points
Tutor III Math 

177) Which of the following is the unit digit in (1570)^2 + (1571)^2 + (1572)^2 + (1573)^2?

(A) 2
(B) 4
(C) 6
(D) 7
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Correct Answer - Option (B)

Explanation :
Pick up the unit digit of each number and multiply them; 0^2 in (1570)^2 = 0 1^2 in (1571)^2 = 1 2^2 in (1572)^2 = 4 3^2 in (1573)^2 = 9 On adding the unit digits, we will get, 0 1 4 9 = 14 (unit digit = 4) So, on adding (1570)^2 (1571)^2 (1572)^2 (1573)^2, the unit digit will be 4.

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You are learning MCQ Questions of BANK PO Department : 62 | Page : 18

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