book Maths Puzzle Numerical Ability

What kind of prperty is 1x4=4?

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need help solving this problem:
A=18.98 B=3.3 C=2.28 solve for D

A + B x C >= D

thanks. please help solve this
3x=wyz

solve for x, w, and y
please explain so i can try to do others without help, thank you very much