 
 <prompt> There are 120 cards in a box. If 2/5 of the cards are red, exactly 5/9 of the remainder are black, and the rest are green, calculate the number of green cards in the box?

Fi 120 kadi ni ibi. Ti 2/5 nikan ti kadi won ni pupa, 5/9 ti awon kadi to wa ni idagbasoke ni dudu, ati awon to wa ni alawo, se idanwo nomba ti awon alawo ni ibi? <response>: Iye awọn kátì kòkòrò ni ibè, 2/5 ní nọmbà gbogbo, jẹ 2/5*120 = 48.
Iye awọn kátì tó kò kòkòrò jẹ 120-48 = 72.
Tó bá wà ni 5/9 ní awọn kátì tó fẹ́, bíi náà ni 5/9*72 = 40 awọn kátì dúdú ni ibè.
Tó bá wà ni awọn kátì tó fẹ́, bíi náà ni 72-40 = 32 awọn kátì alawọ ni ibè.

Ìròyìn tuntun: 32. 