With tricky geometry problems, always draw the figure to scale as much as possible, and remember that every issue reverts back to your basic geometric rules. Arc RTU is what fraction of the total circumference here?
With probability, use slots to represent each of the picks you will be making. Lable what you want to happen, and then fill in the appropriate probability of that happening, How many envelopes need to match their correct or incorrect addresses here?
With mixture problems, you don’t need to juggle two different substances at the same time. Pick one of them! If Bob’s ideal ethanol mix is 10% ethanol, how far does that land comparatively between the two things he’s mixing?
Similarly, if cars and trucks combined for a 1% revenue gain, how does that revenue change land comparatively between that of trucks and that of cars?
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