Question
An oil exploration company intends to drill an
exploratory well in each of two geologically unrelated regions A and B. If the probability of finding oil in significant quantities is assessed as â…› for area A and 1/10 for area B, what is the probability that at least one of the wells will be successful?Solution
In a class, the present students are in the ratio of boys to girls as 4:1. If 10 girls are absent and they form 10% of the total class strength, and no ...
One-fourth of a number is 70. What will 40% of that number?
...If we add 1 to the numerator and subtract 1 from the denominator a fraction becomes 1. It becomes 1/4 if we only add 7 to the denominator what is the fr...
What is the smallest number that needs to be added to 978 to make it a multiple of 37?
A two-digit number is such that the sum of its digits is 10. If 36 is added to the number, the digits interchange their places. Find the number.
Three numbers are in the ratio 5:7:11. If the difference between the sum of the smallest and the largest number and the sum of the smallest and the seco...
If a number is increased by 30% and 12 is subtracted from it, the result is the same as 9.6 more than 30% less of the original number. What is the numbe...
- Three positive numbers are in the ratio 2:3:4. If the sum of their squares is 2349, what is the average of the two largest numbers?
The sum of the first 123 terms of the geometric progression (GP) is equal to the sum of the first 121 terms of the Ursa geometric progression (GP). When...
What is the largest three-digit number that, when divided by both 13 and 17, leaves a remainder of 12 in each case?
