咩係“ twice a number ” ?? [[急需!!!!!! =[

Twice 可以解做「2次」, 「2倍」
係數學上, Twice a number = 某數既2倍

跟返你既example, Five is 6 less than twice a number, 條程式寫出黎會係:
5 = 2X - 6
2X = 11
X = 11/5

twice a number 係一個數乘2→( x+x)
所以條式係→5 + 6 = 2x