Hi, 

Let x/100 represent the % of that mixture

.35*2m^3 + .15*6m^3 = x/100*8m^3

1.60/8m^3 = x/100

.20 = x/100

20% = x  the % of sand in this mixture

.20*8 = 1.6m^3 of sand in that new mixture



checking our answer

.7m^3  + .9 m^3 = 1.6m^3 

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