ExamAdept

3251 + 587 + 369 - ? = 3007

A:

1250

B:

1300

C:

1375

D:

1200

Answer: D

 3251          Let 4207 - x = 3007
+ 587          Then,  x = 4207 - 3007 = 1200
+ 369
 ----
 4207
 ----

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What is the unit digit in the product (3⁶⁵ x 6⁵⁹ x 7⁷¹)?

A:

1

B:

2

C:

4

D:

6

Answer: C

Unit digit in 3⁴ = 1 Unit digit in (3⁴)¹⁶ = 1

Unit digit in 3⁶⁵ = Unit digit in [ (3⁴)¹⁶ x 3 ] = (1 x 3) = 3

Unit digit in 6⁵⁹ = 6

Unit digit in 7⁴ Unit digit in (7⁴)¹⁷ is 1.

Unit digit in 7⁷¹ = Unit digit in [(7⁴)¹⁷ x 7³] = (1 x 3) = 3

Required digit = Unit digit in (3 x 6 x 3) = 4.

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On dividing a number by 68, we get 269 as quotient and 0 as remainder. On dividing the same number by 67, what will the remainder ?

A:

0

B:

1

C:

2

D:

3

Answer: B

Number = 269 x 68 + 0 = 18292

 67) 18292 (273
     134
     ----
      489
      469
      ----
       202
       201
       ---
         1
       ---
       
Therefore, Required remainder = 1

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The difference between the place values of two sevens in the numeral 69758472 is

A:

0

B:

6993

C:

699930

D:

None of these

Answer: C

Required difference = (700000 - 70) = 699930

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The sum of all two digit numbers divisible by 5 is:

A:

1035

B:

1245

C:

1230

D:

945

Answer: D

Required numbers are 10, 15, 20, 25, ..., 95

This is an A.P. in which a = 10, d = 5 and l = 95.

t_n = 95 a + (n - 1)d = 95

10 + (n - 1) x 5 = 95

(n - 1) x 5 = 85

(n - 1) = 17

n = 18

Requuired Sum =	n	(a + l)	=	18	x (10 + 95) = (9 x 105) = 945.
	2			2

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Questions for: Numbers