book Maths Puzzle Numerical Ability

i don not understand how you do this...when i do it my teacher counts it wrong...so i really need som help please...
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{{{2a-4b+6c+9}}}
{{{1a+1b+2c-6}}}

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HELP WITH WRITING EQUATIONS FOR WORD PROBLEMS. JUST STARTING TO LEARN PRE-ALGEBRA.

#1 WORD PROBLEM:
Jordan drove his car at 60mph for the same number of hours t A rancher is planning to put up 220 yards of fencing. In the morning she puts up 80 yards, and in the afternoon she puts up 40% of the remaining fence.What percent of the fence did she put up that day?