Which pattern could have been used to create the sequence?

Question

20, –40, 80, –160, 320


Multiply the previous term by –2

Divide the previous term by 2

Subtract 60 from the previous term.

Add –60 to the previous term.

Answer 1

If this is a multiple choice question, can't you just test each?

e.g. for (A): -160 x -2 = 320
Therefore, the answer is "multiply the previous term by -2"

To check that the rest are incorrect:
for (B): -160 /2 ≠ 320
for (C): -160 - 60 ≠ 320
for (D): -160 + -60 ≠ 320

NOTE: ≠ means 'not equal to'