self Maths Puzzle

At a pizza hut fast food resturant aditi can buy 3 burgers,7 shakes and one order of fries for rs.120/- exatcly at the same place it would cost 164.50 for 4 burgers,10 shakes and one order of fries.how much would it cost for an ordinory meal of one burger,one shake and no order of fries?

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self Other Question
A number when divided by 342 gives a remainder 47. When the same number is
divided by 19, what would be the remainder? The least common multiple of two natural numbers a and b, is 399. What is the minimum possible sum of the digits of the number a(given a > b)?