book Maths Puzzle Numerical Ability

Please Help... Two trains left a station traveling in opposite directions at the same rate. One train traveled 372 miles in 1.5 hours more than it took the other train to travel 27

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book Other Question

Solve the determinant
3 x
1 1 = 2

(the 3 x and 1 1 are inside determinant signs) A chemist has 800 grams of a dye solution that is 20% of it original strength. How much dye must be added to increase the strength to 50%?