Question

'I decided to add 8.6 to my number then multiply the result by 3, After that I subtracted 1.9 then doubled the result. The answer is 59.2'

What number was Savannah first thinking of?

Answer 1

• The number was 1.9

------------------------------------------

Let the number be x.

Set up equation to reflect all the operations:

• ((x + 8.6)*3 - 1.9)*2 = 59.2

Solve it in below steps:

• ((x + 8.6)*3 - 1.9)*2 = 59.2
• (x + 8.6)*3 - 1.9 = 59.2/2
• (x + 8.6)*3 - 1.9 = 29.6
• (x + 8.6)*3 = 29.6 + 1.9
• (x + 8.6)*3 = 31.5
• x + 8.6 = 31.5/3
• x + 8.6 = 10.5
• x = 10.5 - 8.6
• x = 1.9