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LEAP Administrator 5 years ago Problem Solving | Arithmetic

The value of is how many times the value of 2^-17 (more)

The value of (2^-14 2^-15 2^-16 2^-17) / 5 is how many times the value of 2^-17

A. 3/2
B. 5/2
C. 3
D. 4
E. 5

Answer

Himanshu Math Tutor 5 years ago Top reply

(2^-14 + 2^-15 + 2^-16+ 2^-17) / 5

2^-17 (2³ + 2² + 2 + 1) / 5

2^-17 (15)/5

2^-17 * 3

Answer is 3

Option C is correct

LEAP Administrator 5 years ago Problem Solving | Arithmetic

Which of the following expressions can be written as an integer? (more)

Which of the following expressions can be written as an integer?

${ I.\quad \left( \sqrt { 82 } \sqrt { 82 } \right) }^{ 2 }\\ \\ II.\quad 82\sqrt { 82 } \\ \\ III.\quad \frac { \sqrt { 82 } \sqrt { 82 } }{ 82 }$

(A) None
(B) I only
(C) III only
(D) I and II
(E) I and III

Answer

Himanshu Math Tutor 5 years ago Top reply

Statement I

${ \left( \sqrt { 82 } +\sqrt { 82 } \right) }^{ 2 }\\ =\quad { \left( 2\sqrt { 82 } \right) }^{ 2 }\\ =\quad 4*82\quad =\quad 328$

Yes

Statement II

$\\ \\ 82\sqrt { 82 }$

No further simplification possible. Can't be written as an integer

Statement III

$\\ \\ \frac { \sqrt { 82 } \sqrt { 82 } }{ 82 } \\ \\ =\frac { 82 }{ 82 } =1$

Can be written as an integer

Correct option E.

LEAP Administrator 5 years ago Problem Solving | Arithmetic

1/2+((2/3?3/8)/4)?9/16 (more)

$\frac { 1 }{ 2 } \frac { \frac { 2 }{ 3 } *\frac { 3 }{ 8 } }{ 4 } -\frac { 9 }{ 16 } =?$

Answer

Himanshu Math Tutor 5 years ago Top reply

$\frac { 1 }{ 2 } +\frac { \frac { 2 }{ 3 } *\frac { 3 }{ 8 } }{ 4 } -\frac { 9 }{ 16 } =?\\ \\ =\frac { 1 }{ 2 } +\frac { 1/4 }{ 4 } -\frac { 9 }{ 16 } \\ \\ =\frac { 1 }{ 2 } +\frac { 1 }{ 16 } -\frac { 9 }{ 16 } \\ \\ =\frac { 8+1-9 }{ 16 } =0$

LEAP Administrator 5 years ago Problem Solving | Arithmetic

For any positive integer n, the sum of the first n positive integers equals n(n+1)/2. What is the sum of all the even integers between 99 and 301? (more)

For any positive integer n, the sum of the first n positive integers equals n(n 1)/2. What is the sum of all the even integers between 99 and 301?

A. 10,100
B. 20,200
C. 22,650
D. 40,200
E. 45,150

Answer

Himanshu Math Tutor 5 years ago Top reply

We have to find out the sum : 100 + 102 + 104 + . . . + 300

= 2 (50 + 51 + 52 + . . . + 150)

{We can use sum of an Arithmetic progression formula, but for the sake of the question we can use the formula in the question}

= 2 (1 + 2 + 3 + . . . + 50 + 51+ . . . + 150 - (1 + 2 + 3 + . . . + 49))

= 2 (150*151/2 - 49*50/2)

= 150*151 - 49*50

= 20200

B is correct.

LEAP Administrator 5 years ago Problem Solving | Arithmetic

When positive integer x is divided by positive integer y, the remainder is 9. If x/y = 96.12, what is the value of y? (more)

When positive integer x is divided by positive integer y, the remainder is 9. If x/y = 96.12, what is the value of y?

Answer

Himanshu Math Tutor 5 years ago Top reply

Given that

when x is divided by y, the remainder is 9

also given x/y = 96.12 ... Eq 2

we can say that

x = 96y + 9

from Eq. 2

(96y + 9) / y = 96.12

96 + 9/y = 96.12

9/y = 0.12

y = 9/0.12 = 75

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Tags : arithmetic

The value of is how many times the value of 2^-17 (more)

Which of the following expressions can be written as an integer? (more)

1/2+((2/3?3/8)/4)?9/16 (more)

For any positive integer n, the sum of the first n positive integers equals n(n+1)/2. What is the sum of all the even integers between 99 and 301? (more)

When positive integer x is divided by positive integer y, the remainder is 9. If x/y = 96.12, what is the value of y? (more)