book Maths Puzzle Numerical Ability

Can someone please help me solve this one. Thanks

Write a system of two equations in two unknowns for each problem. Solve each system by substitution.

47.) Different interes

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book Other Question
In an election poll, 56% of 400 voters chose a certain canditate. Find the margin of sampling error. please help me solve this equation 8[(26+10)-4(3+2)]