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Maths Puzzle
Numerical Ability
How many gallons of a 15% acid solution must be mixed with 2 gallons of a 23% acid solution to make a 18% acid solution?
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When the ancient Egyptians were building the great pyramids at Giza, they checked each course or level of stones to make sure they were being laid square by measuring th diagonals.
y=4x+1
y=4x-3
i am trying to solve this by elimination, substitution or graphing. i think that if a mult. the 2nd equation by -1, i can use elimination. however, it will cancel