120 nuts

Divide 120 nuts in a ratio of 4: 6.

Correct result:

a =  48
b =  72

Solution:

$$\begin{gathered} n=120 \\ d=4+6=10 \\ a=n\cdot {\displaystyle \frac{4}{d}}=120\cdot {\displaystyle \frac{4}{10}}=48 \end{gathered}$$

$b=n-a=120-48=72$

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