exam Maths Puzzle Numerical Ability

PLEASE HELP ME;
Find the number LOG5(1/5)

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exam Other Question

A hamburger costs 1.25 less than a sundae. If a one hamburger and one sundae cost 6.45, how much does one hamburger cost? Solve the problem. The perimeter of a rectangle is 62 m. If the width were doubled and the length were increased by 21 m, the perimeter would be 120 m. What are the length and width of the rectangle?