book Maths Puzzle Numerical Ability

I've completely forgotten algebra and solving for "x".

if I have a price list of $91.80 and that value is the lowest published price x 1.5 - how do I arrive at the lowest publ

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The sum of two integers is thirty. Eight times the smaller integer is six more than five times the larger integer. Find the integers. The sound of thunder travels away from a lightning flash at 331m/s. Joe sees a
lightning flash, & then hears the thunder 12 seconds later. Howfar away is Joe from the lightning flash?