exam Maths Puzzle Numerical Ability

1.5x-2y=-0.25
3x+1.5y=6.375

Solve with addition method

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exam Other Question

2logx-log7=log112 Lina Chen invest $24,000, part at 8% and the rest 7.2%. How much did she invest at each rate if her income from the 8% investment is two thirds that of the 7.2% investment?