book Maths Puzzle Numerical Ability

Find a positive or negative number for each letter such that O+N+E=1, T+W+O=2, T+H+R+E+E=3, etc. up to T+E+N=10(Note: it is possible to go from ZERO to TWELVE)

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suppose that in 2000, the cost of a compact car averaged $13200 and in 2003 the cost averaged $15200. Assuming that the relationship between time(t) and cost(c) is linear, develop how do you do

6-/4y+10/ when y=5