The sum of two times a number and 5 is 45 what is the number?

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Answer 1 · 2016-11-21T01:44:11

20

The sum: +

Two times a number: 2x

Let #x# be the unknown number that #2# is being multiplied by

The sum of 2 times a number and 5:

#2x+5=45#

Perform the opposite operation on the left side of the equation by subtracting #5# on both sides of the equation

#2x=40#

Isolate #x# by performing the opposite operation, which is division of #2#, on both sides of the equation

#x=20#

The unknown number is #20#