Maths Quiz 19.04.2009
5 Questions
| Attempts: 253
Test your Basic Maths Skills. .
Questions and Answers
- 1.
The sum of the even numbers between 1 and n is 79*80, where n is an odd number, then n=?
Explanation
First term a=2, common difference d=2 since even number
therefore sum to first n numbers of Arithmetic progression would be
n/2(2a+(n-1)d)
= n/2(2*2+(n-1)*2)=n(n+1) and this is equal to 79*80
therefore n=79 which is odd...Rate this question:
- 2.
The price of a bushel of corn is currently $3.20, and the price of a peck of wheat is $5.80. The price of corn is increasing at a constant rate of 5x cents per day while the price of wheat is decreasing at a constant rate of cents per day. What is the approximate price when a bushel of corn costs the same amount as a peck of wheat?
- A.
$4.50
- B.
$5.10
- C.
$5.30
- D.
$5.50
- E.
$5.60
Correct Answer
E. $5.60 -
- 3.
How many randomly assembled people do u need to have a better than 50% prob. that at least 1 of them was born in a leap year?
Correct Answer
3 - 4.
In a basketball contest, players must make 10 free throws. Assuming a player has 90% chance of making each of his shots, how likely is it that he will make all of his first 10 shots?
Correct Answer
.35
0.35
0.348 - 5.
AB + CD = AAA, where AB and CD are two-digit numbers and AAA is a three digit number; A, B, C, and D are distinct positive integers. In the addition problem above, what is the value of C?
- A.
1
- B.
3
- C.
7
- D.
9
- E.
Can not be determined
Correct Answer
D. 9 -
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