Alex spend 45% of his saving in a new skateboard that cost $80. how much did alex had in his savings before buying the skateboard?

The total savings amount of Alex before buying the board  is  $177.78.

Step-by-step explanation:

Let us assume the total savings of Alex  = $m

The cost of skateboard = $85

So now, the cost of skateboard  = 45 % of his savings

⇒  45 % of m = $80

or, m = $177.78

Hence, the total savings amount of Alex before buying the

board is  $177.78.

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

1/4 because there is 4 grades.