Question

140% x   X + 0,5 x X = 0,75

Answer 1

\(140\%\times x+0,5\times x=0,75\\ \Rightarrow1,4\times x+0,5\times x=0,75\\ \Rightarrow\left(1,4+0,5\right)\times x=0,75\\ \Rightarrow1,9\times x=0,75\\ \Rightarrow x=0,75:1,9\\ \Rightarrow x=\dfrac{15}{38}\)

Answer 2

\(\dfrac{140}{100}\times x+\dfrac{1}{2}\times x=0,75\\ x\times\left(\dfrac{140}{100}+\dfrac{1}{2}\right)=0,75\\ x\times\dfrac{19}{10}=0,75\\ x=\dfrac{15}{38}\)