book Maths Puzzle Numerical Ability

An herbalist has 30 oz of herbs costing $2 per oz. How many ounces of herbs costing $1 per oz should be mixed with the 30 oz to produce a mixture costing $1.60 per oz.
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What do lenths have to do with this? Hi,

How do you tell if a function is linear? Example of a question would be: State whether this is linear. I know that the equation f(x) = mx + b is used, but can someone give me an example, please?

Thanks so much! I really appreciate it!