If 9=10 8=18 7=24 6=28 5=30 3=??
Answers
If 9=10 8=18 7=24 6=28 5=30 3=??
Your answer is 28. The explanation is as follows:
Let's not first focus the main numbers. Let's take the answers.
10, 18, 24, 28, 30, ---, ?
They have given for 9, 8,7,6 and 5. Then, the fourth one is not given. They have asked for the third one.
If the numbers are observed carefully, you can notice that the difference between the first two numbers is 8, next two is 6, then its 4 and finally 2. We can now say that the difference between the differences s 2.
10 [8] 18 [6] 24 [4] 28 [2] 30
Now, it's obvious that the next difference will be 0. So, 4 = 30 only.
10 [8] 18 [6] 24 [4] 28 [2] 30 [0] 30
Here comes the twist. This time, the difference would be 0-2 = -2.
Now, 30 + (-2) = 28. [you can do this if you know integers properly]
10 [8] 18 [6] 24 [4] 28 [2] 30 [0] 30 [-2] 28.
PS - Here, you can also say that 6 = 3.