exam Maths Puzzle Numerical Ability

a choclate bar weighs 4.56 oz what is the greatest possible error

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exam Other Question

y1=1/x+3, y2=1/x, and y1+y2=1/15
Find all the values of x Marty bought 5 lbs. of apples for 98 cents a pound. a week later, she bought 7 lbs. of apples for 74 cents. what was the average price per pound that marty paid for apples?