book Maths Puzzle Numerical Ability

percents proportion

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book Other Question

Tyrin can paint a house in 4 days. Tahjai can paint the same house in 5 days. How many days will it take to paint the house if they work together?

I have 2.22 days Evaluate the expression: 3.2^-3/5.

I have come up with two different answers when I went my an checked my work.

Thanks so much for anyones help