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1
If the arithmetic mean of seventy five numbers is 35. If each number is increased by 5, then mean of new number is ____?
- 30
- 40
- 70
- 90
See Answer
Answer
: 40
Explanation
:
To find the new mean after increasing each number by 5, you can follow these steps:
1. Original mean: 35
2. Number of values: 75
When each number is increased by 5, the new mean will be:
New Mean=Original Mean+5
New Mean=35+5=40
So the correct answer is B. 40.
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2
Binary number 10101 is equivalent to its decimal equivalent ___?
- 10
- 20
- 21
- 111
See Answer
Answer
: 21
Explanation
:
To convert the binary number 10101 to its decimal equivalent, you can use the positional notation system. Each digit in a binary number represents a power of 2, starting from the rightmost digit as 2^0, then increasing by one power for each subsequent digit to the left.
So, 10101 in binary is calculated as:
1 * 2^4 + 0 * 2^3 + 1 * 2^2 + 0 * 2^1 + 1 * 2^0 = 16 + 0 + 4 + 0 + 1 = 21
Therefore, the correct answer is:21
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3
If a geometric sequence starts with a first term of 2 and grows exponentially by a factor of 3, what is the sum of the 4th and 5th terms?
- 216
- 54
- 162
- 24
See Answer
Answer
: 216
Explanation
:
If a geometric sequence starts with a first term of 2 and grows exponentially by a factor of 3, what is the sum of the 4th and 5th terms?
1st term = 2
2nd term = 6
3rd term = 18
4th term = 54
5th term = 162
4th term + 5th term = 54 + 162 = 216.
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4
If 20% of an electricity bill is deducted, then Rs. 100 is till to be paid. How much was the original bill?
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5
Naeem sold a computer for Rs 25000 at which he suffered 20percent loss. Find the purchase price of the computer.
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6
A student multiplied a number by
4⁄5 instead of 5⁄4
What is the percentage error in the calculation
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7
In an election between two opponents, one got 65percent of the total valid votes, 20percent of the votes were invalid. If the total number of votes was 7500, the number of valid votes that the other candidate got, was:
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8
Sajid paid
3⁄8 of his salary as a house rent. The percentage of house rent and remaining amount will respectively be
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9
Naeem gave 25percent of a profit to his partner. If the partner got Rs.4000, what will remain with him
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10
A vendor sells 40percent of his stock of oranges and is left with only 420 oranges. What was the total number of oranges available before the sell