Marbles

Dave had 40 marbles. Junjun has 2 1/5 more than Dave’s marbles. How many marbles do they have altogether?

Correct result:

x =  128

Solution:

$$\begin{gathered} d=40 \\ k=2{\displaystyle \frac{1}{5}}={\displaystyle \frac{2\cdot 5+1}{5}}={\displaystyle \frac{11}{5}}=2.2 \\ j=k\cdot d=2.2\cdot 40=88 \\ x=d+j=40+88=128 \end{gathered}$$

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