 
 <prompt> Sarah's age is equal to three times Mark's age minus 4. Mark is four years older than Billy. Billy is half Ana's age. If Ana will be 15 in 3 years, how old is Sarah? <response>: ```A nan gaba, duba yaya Ana ta da cikin shekaru yanzu da kuma 3: 15 - 3 = 12
Bayananku, duba yaya Billy yana da cikin shekaru ta baki Ana: 12 / 2 = 6
Yanzu duba yaya Mark yana da cikin shekaru bayananku: 6 + 4 = 10
Yanzu, don duba yaya Sarah, saboda haka, saboda haka, duba yaya Mark da 3: 10 * 3 = 30
A sannan, bada 4 daga cikin mafi kyau da Mark shekaru don samun yaya Sarah: 30 - 4 = 26

Javobi zai kasance 26.``` 