exam Maths Puzzle Numerical Ability

If a computer program draws aspiral at a reate of 45% every 20 seconds then how long will it take to complete 25 full turns?

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exam Other Question

Help needed simplifying the complex fraction

44.

4 + 2
________ ______
x2-9 x-3
__________________
1 + 1
___ ______
x+3 x-3 Ricardo is 4 years less than twice as old as his sister. The sum of their ages is 20. How old is Ricardo?