Question 955999
Fresh mango with 70% water has
{{{ 100 - 70 = 30 }}} 30%  mango
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{{{ .3*20 = 6 }}} kg mango in 20 kg 
of fresh mango
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Dry mango with 10% water has
{{{ 100 - 10 = 90 }}} 90% mango
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{{{ 6 = .9x }}}
{{{ x = 6.667 }}}

20 kg of fresh mango is equivalent 
to 6.667 kg of dry mango