How many gallons of 20 % alcohol solution and 35 % alcohol solution must be mixed to get 9 gallons of 25 % alcohol solution?

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What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap