Answer :

First, we have to round each number to the nearest ten.

[tex]\begin{gathered} 67\approx70 \\ 42\approx40 \\ 19\approx20 \\ 23\approx20 \end{gathered}[/tex]

Then, we add all the rounded numbers.

[tex]70+40+20+20=150[/tex]

Therefore, an estimated sum is 150.

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