Q: You are provided with an arithmetic question. Your task is to compute the solution using the given arithmetic operations. The only arithmetic operators needed to answer the questions are'+'(addition) and'-'(subtraction). The answer should be correct to one decimal place.
Mary had 21 dimes and 38 pennies in her bank. Her dad borrowed 18pennies from Mary. How many pennies does she have now?
A:
20.0