 
 <prompt> A swimming pool is being emptied through a drain at the bottom of the pool and filled by a hose at the top. The drain can empty the pool in 4 hours and the hose can fill the pool in 6 hours. The pool holds 120 liters of water. If the pool starts filled with water, how much water will be left after 3 hours? 

N'ime ụlọ ọgwụ na-achọ n'etiti nke ụlọ ọgwụ na-achọ n'elu. Ọdịnaya nwere ike ịchọ ụlọ ọgwụ n'ime ọgwụ na-achọ n'elu n'ọdịnaya 4 na ụlọ ọgwụ nwere ike ịchọ n'ime ọgwụ n'ime ọgwụ n'ọdịnaya 6. Ụlọ ọgwụ na-eme 120 liters n'ụlọ ọgwụ. Ọ bụghị n'ihu ụlọ ọgwụ na-eme n'ime mmadụ mgbe 3 na-agbanyeghị? <response>: Nke a bụ, ọdịda na-achọ 4 ụtụ, n'ime ọ bụla, nke a na-achọ na aka 120 liters / 4 ụtụ = 30 liters/nkeji.
Maka 3 ụtụ, ọdịda ga-achọ 3 * 30 = 90 liters n'ime ọ bụla.
Nke a na-achọ na aka ụkwụ 6 ụtụ, n'ime ọ bụla, nke a na-achọ na aka 120 liters / 6 ụtụ = 20 liters/nkeji.
Maka 3 ụtụ, ụkwụ ga-eme 3 * 20 = 60 liters n'ime ọ bụla.
Maka 3 ụtụ, ọ bụla ga-eme 120 liters + 60 liters - 90 liters = 90 liters n'ime ọ bụla.

Nke a bụ ọdịda: 90. 