Question 1116125
Let {{{ x }}} = tons of potatoes per acre collected
before new methods
{{{ x + 4 }}} = tons of potatoes collected after
the new technology
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{{{ 320*( x + 4 ) = 400x + 640 }}}
{{{ 320x + 1280 = 400x + 640 }}}
{{{ 80x = 640 }}}
{{{ x = 8 }}}
and
{{{ x + 4 = 12 }}}
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Before new methods:
{{{ 320*8 = 2560 }}}
2,560 tons were collected
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After new methods:
{{{ 320*12 = 3840 }}}
3,840 tons were collected
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check:
{{{ 320*( x+4 ) = 400x + 640
{{{ 320x + 1280 = 400x + 640 }}}
{{{ 2560 + 1280 = 400*8 + 640 }}}
{{{ 3840 = 3200 + 640 }}}
{{{ 3840 = 3840 }}}
OK
feel free to get a 2nd opinion