exam Maths Puzzle Numerical Ability

Explain what it means for an equation to have an extraneous solution. Give an example.

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Please help me solve this: How many pounds of tea worth $1.50 per pound should be mixed with tea worhth $1.70 per pound to make 40 pounds of blended teas to sell at $1.55 per pound? Thank you Here are 2 superficies . The first one has 200 hectars and the second one 45 hectars.How much hectars of each superficie have to be cultivated for the wheat if in the first superfi