Explain how you know 12.6, 3.1, 5.4, greater than 20

Given numbers 12.6, 3.1 and 5.4

=> 12.6

=> 3.1

=> 5.4

These 3 are all smaller than 20.

Explain why is it greater than 20?

Very simple, simply add those given numbers

=> 12. 6 + 3.1 = 15.7

=> 15.7 + 5.4 = 21.1

=> 21.1 > 20, 20 is less than 21.1

That’s that reason why the given numbers is greater than 20. When you add the 3 numbers, the sum is greater than 20.