Question

Which of the expressions are equivalent to the one below? (15•3)-20

A. (3-20)•(15-20)
B. (3•15)-20
C. 6•(15-20)
D. 20-(3•15)

Answer 1

B should be equivalent

Explanation:

Answer 2

Note that the given (15•3)-20 involves multiplication and subtraction. The mult. must be carried out first. Thus, (15•3)-20 = 45-20, or (3*15)-20. Only answer B is equivalent to (15•3)-20.