book Maths Puzzle Numerical Ability

the sum of two numbers is 25. 12 less than 4 times one number is 16 greater than 2 times the other number. What is each number?

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how do i work out 3% solution from a 6% solution of 1.5ml hydrogen peroxide solution? A=3; B=13
G-A=3
F+G=D
C+D+E=B
C-D=G
B+E=C+D Please solve this for me!