exam Maths Puzzle Numerical Ability

Not sure how to to solve this, transforming equations.
-300=15x
I got x=20
Please and Thank You=)

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4b-5=negative t solve for b A butcher combines 100 lb of hamburger that costs $2.40 per pound with 60 lb of hamburger that costs $3.20 per pound. Find the cost of the hamburger mixture.