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?