50 is 10 less than two-thirds of a number. Find the number

50 is 10 less than two-thirds of a number. Find the number

Let X be the number
x×2/3-10=50
x=60×1.5
x=90
So the number is 90
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Set up the equation and find out the solution of the equation 1: add 3 times of a number to get 27, find the number. (and test)

Let this number be X
3X+3=27
3X=27-3
3X=24
X=24/3
X=8
Test: 3 times of 8 plus 3 is 27 8 * 3 + 3 = 27

(1) 30% of a number is 272. What is the number? (2) What percentage is 17.5 tons less than 20 tons?

(1) 272 △ 30% = 45, answer: this number is 45; (2) (20-17.5) △ 20, = 2.5 △ 20, = 0.125, = 12.5%, answer: 17.5 tons is 12.5% less than 20 tons