exam Maths Puzzle Numerical Ability

How is this equation solved? 0.40x+0.06(30)=0.20(49)

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exam Other Question

The length of a rectangle is 1 cm more than 5 times its width. If the area of the rectangle is 79 cm2, find the dimensions of the rectangle to the nearest thousandth.

I get so confused on these questions. I am just lost on this. Please help!!! One invention saves 30 % on fuel; a second saves 45 percent; a third saves 25%. If you use all three inventions at once, how much fuel can you save