book Maths Puzzle Numerical Ability

what is the decimal for 45%

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book Other Question

distributive
- y ( - y squared + y)

How can i figure out this inequality by simplifying to distributive?

x + 20 + 0.06 (x + 20 )
bob has $3 more than Carol, and Carol has twice as much as Leon. Together they have $108. How much does each person have?