Answers ( 3 )
  • See question detail

    \(20+30+40+50+60\)

    \(=\left(20+60\right)+\left(30+50\right)+40\)

    = \(80+80+40\)

    \(=200\)

  • See question detail

    \(10+20+30+40+50+60\)

    \(=\left(10+60\right)+\left(20+50\right)+\left(30+40\right)\)

    \(=70+70+70\)

    \(=70.3\)

    \(=210\)