Well, there is 90 degrees in an angle!
It is 90 because 90% of 90 = 81
In Idaho, it is the rule of 90 - number of years worked plus age = 90.
If your 18 it's special...
90 has factors other than 1 and itself, so it is not a prime number. For example, 90 is 9 x 10, so it is a composite number.
The median is the number which is in the middle of a data set when you order the set from smallest to largest. So this set is 45, 46, 90, 90, When you have an even number of numbers, you add the two middle number and divide by two So the median is 46+90 divided by 2.
89 and 91 are both prime numbers, so when asked the prime number closest to 90, the answer is that 90 is surrounded by two prime numbers
Oh, dude, math time! So, if 90 is 150% of a number, we can find the original number by dividing 90 by 1.5 (since 150% is the same as 1.5). So, 90 divided by 1.5 is 60. Ta-da! The original number is 60. Math can be fun... sometimes.
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200% of a number is 90, so 100% of a nubmer is 45, so 45 is 80% 0f a number therfore a number is 45/80*100=225/4