50 is 40% of what number? and we need to do the proportions/ example 50/100 etc. and explain.. : )

50/X = 40/100

50 × 100 = 40 × X

5000 = 40X

5000/40 = 40X/40

125 = X

X= 125

the equation is 
is/of       %/100

50 = is 
40 = % 
X = of
100 = 100
  
50 X 100 = 5,000
40 X x = 40x 

40x / 40 = x
5,000 / 40 = 125 

SO... x = 125

What’s your question.