Find number of people rode trains and buses and only buses


The recent transportation survey of w urban commuters (i.e., n(U)=w) yielded given information:

X rode neither trains nor buses

Y rode trains
Z rode only trains

Find number of people rode (i) trains and buses, (ii) only buses, (iii) buses, and (iv) trains or buses?

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Mathematics: Find number of people rode trains and buses and only buses
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