exam Maths Puzzle Numerical Ability

Sove the porportion.

9. a/5 = 27/45

Any help with this equation would be Greatly</b> appreciated.

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exam Other Question

What is the determinant of:
2 3 0 0
0 -1 0 1
0 0 1 -1
0 0 -2 1

(All numbers are in a big bracket)
Thank you! Find the best buy on pasta sauce (1 qt is 32 oz).

A)
45 oz for $1.59
C)
1 qt for $1.29
B)
1 qt 16 oz for $1.99
D)
48 oz for $1.79