Lara chooses a number less then 20 she divided it by 2 and then adds 6 she then divides this result by 3 her answer is 4.5 what was the number she started with ?

For questions like this, we will work backward to arrive at the initial number.

Start with the final answer. The answer is 4.5.

[divided by 3,] so we will multiply by 3
4.5 x 3 = 13.5

[Add 6], so we will subtract 6
13.5 - 6 = 7.5

[divided by 2], so we will multiply by 2
7.5 x 2 = 15


The initial number is 15.