School dance

Lucy and JoJo need to make 140 cupcakes for the school dance. Lucy made 3/5 of the cupcakes. JoJo made 42 cupcakes. What fraction of the cupcakes do Lucy and JoJo still need to make?

Correct result:

x =  0.1

Solution:

$$\begin{gathered} t=140 \\ l={\displaystyle \frac{3}{5}}\cdot t={\displaystyle \frac{3}{5}}\cdot 140=84 \\ j=42 \\ x={\displaystyle \frac{t-l-j}{t}}={\displaystyle \frac{140-84-42}{140}}={\displaystyle \frac{1}{10}}=0.1 \end{gathered}$$

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