Good question. * G4 v m7 J3 Z1 W & B8 `( q6 P8 d* R: D$ D" K5 r9 WNative speakers care much much less about the singular/plural consistency than we learners do. If you are an everyday listener, you'd find ton of such inconsistencies in nearly every speech they make. There's just no reasoning to it. 0 g& l- V5 d5 \# Z8 l$ a3 j* F; C! ~0 ]5 `
Pan.