exam Maths Puzzle Numerical Ability

cynthia bought five blank vhs tapes and four cassette tapes for $28.50.
Charlie bought four vhs tapes and two cassette tapes for $21.00 how can I find the cost of each type of tape?

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exam Other Question
On a standard die, the dots on the opposite faces have a sum of 7. How many different sums of dots on three adjacent faces are there on this standard die? the square root of 3 over 2