exam Maths Puzzle Numerical Ability

2x+3+3x=x+11

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exam Other Question

Jack usually mows his lawn in 4 hours. Marilyn can mow the same yard in 6 hours. How much time would it take for them to mow the lawn together? A company buys a copier for $10,000. The vaule of the copier is $10,000(1-n/20) after n years. After how many years will the value of the copier be in $65,000?