You should use your calculator for such simple sums. It is far quicker and involves fewer key depressions than posting the question on WA.
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the sum of 54 and 46 is equal to 100 54 + 46 = 100
6/20=54/b 54/b*54 6/20*54/1= 324/20= 16.2 b=16.2
The two equal numbers that have a sum of 54 are 27 and 27. When you add these two numbers together, you get 54. This is because the sum of two equal numbers will always be double the value of one of the numbers. In this case, 27 + 27 = 54.
54 (5 + 4) x 6 = 54
54 x (1 - (20/100)) = 54 x 0.8 = 43.2