exam Maths Puzzle Numerical Ability

I have a homework whick I know nothing about, all it says on the top of the page is APPLICATIONS OF LINEAR SYSTEMS. So what does that mean or what is it that I have to do?

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exam Other Question

please help me solve this equation: (c-5/4=3) I need help on this problem please:
16(x+2)=70.4
Thanks for you help!