Iam have a problem with this math problem x/4= -6 solve for x

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

Yo need asap pls ! markin da brainiest too !

Which image (a’ b’ c’ d’) of abcd cannot he produced using only reflections ?