Three fifths of a number is 8.5 more than 40% of the number. Find the number Use the comprehensive formula!

Three fifths of a number is 8.5 more than 40% of the number. Find the number Use the comprehensive formula!


Let this number be X
x*3/5-0.4x=8.5
0.6x-0.4x=8.5
0.2x=8.5
x=42.5



What's 4 in 20 equal to 1 in 5 equal to 8 in 40 equal to 2?


10