CAT Exam Numerical Ability LCM and HCF

the least number which when divided by 16,18,20,25 leaves 4 as remainder in each case,but when divided by 7 leaves no remainder:

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CAT Other Question

the least number which when divided by 5,6,7 and 8 leaves a remainder 3,but when divided by 9 leaves no remainder is: a certain type of mixture is prepared by
brand A at Rs 9 kg with brand B at Rs 4 kg.if the mixture worth is Rs 7 a kg.how many kgs of brand A are needed to make 40kgs of the mixture?