###Human: Merry is taking care of 10 lambs. Her brother takes care of 3 more lambs than Merry. How many lambs do Merry and her brother have?, ### Assistant: Merry's brother takes care of 10 + 3 = 13 lambs.
So, together Merry and her brother have 10 + 13 = 23 lambs. 
 So the answer is :  23