book Maths Puzzle Numerical Ability

Evaluate the determinants

1. 7 2
3 -6


2. 2 3
3 -4


3. 1 0 -1
-2 3 5
6 -3 4


4. 2 -1 -3
5 9 4
7 6 -2

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book Other Question

Leo's garden, which is 6m wide, has the same area as Jen's garden, which is 8 m wide. Find the lengths of the two rectangular gardens if Leo's garden is 3m longer than Jen's garden if a number is decreased by its reciprocal the result is 11 over 30. find the number.