exam Maths Puzzle Numerical Ability

is 18=-3(-6)true or false or open sentence

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exam Other Question

Everyone shook hands at a party. There were 190 handshakes in all. How many were at the party? (From Algebra by Keedy, Bittinger, Sith and Orfan, p. 221)
I think I can get the 4 c/min.=____qt/h

convert each rate using dimensional analysis