[latex]x-\ number\\\\ 75\%*x=450\\\\ 0,75x=450\ \ \ \ | divide\ by\ 0,75\\\\ x=600\\\\ 450\ is\ 75\%\ of\ 600.[/latex]

75% = 0.75 450 ÷ 0.75 = 600 450 is 75% 0f 600