Question

Consider the numbers 0, 10, 20, 30, and 40. Multiply each by 4 and compare the result to 60 to determine into which of the following intervals the answer to the question "What number can you multiply by 4 and then add 8 to the product to get 60?" should fall.

Select the interval into which the answer should fall.

a) 0 to 10
b) 10 to 20
c) 20 to 30
d) 30 to 40

Answer 1

b) 10 to 20

Explanation:

You have to multiply each of the given numbers by 4, and add 8 to that result.

So:

• 0*4+8 = 8

• 10*4+8 = 48

• 20*4+8 = 88

• 30*4+8 = 128

• 40*4+8 = 168

And 60 is between the result of 10 and 20, so that's the interval you have to select.

The correct answer is b) 10 to 20