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Problem Num : 21 Type: Topic:Number  Theme:None Adjustment# : 32 Difficulty: 1
Category	Factors and multiple
Analysis	96=3*2^5
Solution/Hint

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Problem Num : 22 Type: Topic:Number  Theme:None Adjustment# : 33 Difficulty: 1
Category	Factors and multiple
Analysis	Factorize 3150
Solution/Hint

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Problem Num : 23 Type: Topic:Number  Theme:None Adjustment# : 43 Difficulty: 1
Category	Factors and multiple
Analysis	(10x+y)+(10y+x)=11(x+y)
Solution/Hint

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Problem Num : 24 Type: Topic:Number  Theme:None Adjustment# : 50 Difficulty: 30
Category	Factors and multiple
Analysis	15x+29y=440. 29y=5(88-3x) y should be multiple of 5. but less than 20.
Solution/Hint

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Problem Num : 25 Type: Understanding Topic:Number  Theme:None Adjustment# : 60 Difficulty: 800 level
Category	Factors and multiple
Analysis
Solution/Hint	n=m*k? (1)3n=m*p (2)13n=m*q, m is less than 13 so that it can't be a multiple of 13, which means that q is a multiple of 13. Therefore, n is a multiple of m.

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