book Maths Puzzle Numerical Ability

2/3n-11=4+n

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book Other Question

What are the divisibilty rules to the numbers 13,14,15,16,17,18,19 and 20? Can you help me solve this problem please.

Laurie left home and ran to the lake at 10mph. She ran back home at 8mph. If the entire trip took 27 minutes, how far did she run in