Question
Add the expression :$y^2-x^2, 2 x^2-3 y^2, 5 y^2-3 x^2, 6 x^2+2 y^2$
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| Bus | Bicycle | Walking | Other sources | |
| Number of boys | $80$ | $60$ | $20$ | $85$ |
| Number of girls | $90$ | $75$ | $35$ | $60$ |
