Question

I multiply a certain number by 28, add 14 to the product, dive the sum by 13 and subtract 4 from the results. Uf i obtain twice original number, what number dud i take at first

Answer 1

Answer:

19

Step-by-step explanation:

let the original no. be x

[ 28x + 14 ] ÷ 13 - 4 = 2x

28x + 14 / 13 - 52 / 13 = 2x   [ 4 / 1 ×13 ]

[28x + 14 - 52 ] / 13  = 2x

28x - 38        = 26x    [ 13 ×2x ]

28x - 26x      = 38

2x                  = 38

x                    = 38 / 2

x                    = 19