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lesson 'Regular withdrawals from an annuity account' in section 'Finance'
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lesson 'A tricky problem on a parabola and a straight normal line' in section 'Geometry_Word_Problems'
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lesson 'Equations of straight lines in 3D space' in section 'Geometry_Word_Problems'
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lesson 'Upper league problems on conditional probability' in section 'Probability-and-statistics'
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lesson 'Find the sum of digits of integer numbers' in section 'Divisibility_and_Prime_Numbers'
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lesson 'A soccer ball - write the height equation in vertex form' in section 'Travel_Word_Problems'
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lesson 'A flare is launched from a life raft vertically up' in section 'Travel_Word_Problems'
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lesson 'Upper level problem on solving logarithmic equations' in section 'logarithm'
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lesson 'Logic Rules of Inference and Replacement' in section 'Conjunction'
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lesson 'Find the rate of moving od the tip of a shadow' in section 'Geometry_Word_Problems'
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lesson 'Entertainment problems on percentage' in section 'percentage'
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lesson 'Problems on simple interest accounts' in section 'Finance'
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lesson 'Problems on discretely compounded accounts' in section 'Finance'
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lesson 'Problems on continuously compounded accounts' in section 'Finance'
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lesson 'Real life arithmetic problems' in section 'Numeric_Fractions'
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lesson 'On non-existing a solution to one trisection angle problem' in section 'Geometry_Word_Problems'
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lesson 'Find a triangle with integer side lengths and integer area' in section 'Geometry_Word_Problems'
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lesson 'Clock hands arithmetic word problems' in section 'Numeric_Fractions'
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