Oh, dude, so you want me to do some math for you? Alright, let's break it down. Twice the number 50 is 100, right? And 20 less than 100 is 80. So, 20 less than twice the number 50 is 80. Boom, math wizard right here!
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You can solve this algebraically. Let n be a number.20 - 2n = 5020 = 50 + 2n2n = -30n = -15The number is -15Verify: 20 - 2(-15) = 20 + 30 = 50
'5' & '15' are odd numbers less than 20 , and are also multiples of '5'.
To compare -20 and 14, a positive number (in this case, 14), is always greater than any negative number.
r - 20
19