• #### 1. Average of all prime numbers between 30 to 50

1. 37
2. 37.8
3. 39
4. 39.8

Explanation:

Prime numbers between 30 and 50 are:
31, 37, 41, 43, 47

Average of prime numbers between 30 to 50 will be
\begin{aligned}
(\frac{31+37+41+43+47}{5}) = \frac{199}{5} = 39.8
\end{aligned}

• #### 2. Reeya obtained 65, 67, 76, 82 and 85 out of 100 in different subjects, What will be the average.

1. 70
2. 75
3. 80
4. 85

Explanation:

\begin{aligned}
( \frac {65+67+76+82+85}{5} ) = 75
\end{aligned}

• #### 3. Find the sum of first 30 natural numbers

1. 470
2. 468
3. 465
4. 463

Explanation:

Sum of n natural numbers
\begin{aligned}
= \frac{n(n+1)}{2}
\end{aligned}

\begin{aligned}
= \frac{30(30+1)}{2} = \frac{30(31)}{2} = 465
\end{aligned}

• #### 4. Find the average of first 10 multiples of 7

1. 35.5
2. 37.5
3. 38.5
4. 40.5

Explanation:

\begin{aligned}
= \frac {7(1+2+3+...+10)}{10}
\end{aligned}

\begin{aligned}
= \frac {7(10(10+1))}{10 \times 2}
\end{aligned}

\begin{aligned}
= \frac {7(110)}{10 \times 2} = 38.5
\end{aligned}

• #### 5. The average of four consecutive odd numbers is 24. Find the largest number.

1. 25
2. 27
3. 29
4. 31

Explanation:

Let the numbers are x, x+2, x+4, x+6, then
\begin{aligned}
=> \frac{x+(x+2)+(x+4)+(x+6)}{4} = 24
\end{aligned}

\begin{aligned}
=> \frac{4x+12)}{4} = 24
\end{aligned}

\begin{aligned}
=> x+3 = 24 => x = 21
\end{aligned}

So largest number is 21 + 6 = 27

1. 0
2. 1
3. 5
4. 9

Explanation:

• #### 7. Find the average of all numbers between 6 and 34 which are divisible by 5

1. 15
2. 20
3. 25
4. 30

Explanation:

\begin{aligned}
Average = (\frac{10+15+20+25+30}{5}) = \frac{100}{5} =20
\end{aligned}

• #### Vivek Ganguly 4 years ago

sir plz upload more n new questions of every topic in quant section

good

Good

#### mastguru 4 years ago replied

thanks Nagendra

#### mastguru 4 years ago replied

Sure Vivek.. we are working with it.