exam Maths Puzzle Numerical Ability

3a-4b=6
2(2b+3)=3a

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exam Other Question

31x - 8(3x - 0.745) = 6x + 0.205 Solve the equation. The following multiplication problem, the letters A, B, C and D reberesent four digits. What digit should replace each letter?
ABCD
x 4
DCBA