exam Maths Puzzle Numerical Ability

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

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exam Other Question

Factor the trinomial. Factor out all common monomials first.

9 x 3 - 9 x 2 + 2 x.
If a Home Depot worker can paint a house in 4 hours, and a Lowes worker can paint the same house in 6 hour, how long will it take for both of them to paint the house together?