X: y = 5 : 3 and x + y = 56 work out the value of x - y must show working

Gretchen is setting up for a banquet. she has 300 chairs and needs to distribute them evenly among t tables. how many chairs should she put at each table? write your answer as an expression.

Prove that the sum of two consecutive exponents of the number 5 is divisible by 30.if two consecutive exponents are 5n and 5n + 1, then their sum can be written as 30.

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !