book Maths Puzzle Numerical Ability

EaCH DAY A TRAIN LEAVES PARIS FOR MOSCOW AND AT THE SAME TIME ONE LEAVES MOSCOW FOR PARIS. THE JOURNEYS LAST EXACTLY SEVEN DAYS. HOW MANY TRAINS WILL A PASSENGER MEET ON THE JOURN

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book Other Question
1 + e = 120 A chef needs to mix a 45% fat content cheese with a 20% fat content cheese to obtain 30 grams of a cheese mixture that is 30% fat. How many grams of each kind of cheese must be used?