55 is the middle number on a number line from 20 to 90.
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70
To find 80% of a number, you can multiply the number by 0.8. Given that 20% of the number is 90, we can find the total number by dividing 90 by 0.2. This gives us a total number of 450. Therefore, 80% of 450 is 360.
The Greatest Common Factor of 20 and 90 is 10, because the factors of 20 are: 20:1,2,4,5,10,20 The factors of 90 are: 90:1,2,3,5,6,9,10,15,18,30,45,90 So, the common factors are 1,2,5,10 10 is the greatest number of them so 10 is the Greatest Common Factor. THE ANSWER IS 10
90
(18 ÷ 20) × 100 = 90 Therefore: 90%