Question: 18) (on - 5n 7n ) + (30 + 371 - 8) 203- 7n + 9n- 8 rest hundredth. 20) Emily cancoil the lanes in

18) (on - 5n 7n ) + (30 + 371 - 8) 203- 7n + 9n- 8 rest hundredth. 20) Emily cancoil the lanes in a bowling alley in nine hours Jack cancoil the same lanes in ten hours Find how long it would take them if they worked together

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