exam Maths Puzzle Numerical Ability

The $75 dollar cost for a party was to be shared equally by all those attending. Since 5 more people attended than was expected, the price per person dropped by 50 cents. How many people attended the party?

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Ellen mixes nuts worth $1.60 per pound with oats worth $1.40 per pound to get 20 lbs of trail mix worth $1.54 per pound. How many pounds of nuts and how many pounds of oats should she use? what are the steps when solving an equation using subatitution