Question

40%*X+X*20%=72

Answer 1

 40/100 x X + X x 20/100 = 72

 2/5 x X + X x 1/5 = 72

 X x ( 2/5 + 1/5 ) = 72

X x 3/5 = 72

X = 72 : 3/5

X = 120

Answer 2

Trả lời :

40%*X+X*20%=72

\(40\%\) \(.\)\(x\) \(+\)  \(x\) \(.\) \(\frac{20}{100}\)\(=\)\(72\)

\(\frac{40}{100}\)\(.\)\(x\)\(+\)\(x\)\(\frac{1}{5}\)\(=\)\(72\)

\(x\)\(.\)\(\left(\frac{2}{5}+\frac{1}{5}\right)\)\(=\)\(72\)

 \(x\)\(.\)\(\frac{3}{5}\)\(=\) \(72\)

\(x\)\(=\) \(72\)\(:\)\(\frac{3}{5}\)

\(x\)\(=\) \(120\)

Answer 3

40% * X + X * 20% = 72

X * (40% + 20%) = 72

X * 60% = 72

X * 0,6 = 72

X = 72 : 0,6

X = 120