book Maths Puzzle Numerical Ability

A history test contains 60 multiple choice items, How many items would a student have to correct to earn a score of 80% correct. work the problem out

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book Other Question

help with multiplication/division of monomials; negative exponents please find the lowest common denominator of 3/4 and 5/8 thank you

a. 32
b. 16
c. 8
d. 4