The number that is to be added to 10% of 320 to have the sum as 30% of 230 is :

Answer: Option A

Let the number be x
According to the question,
x + 320 × $$\frac{10}{100}$$ = 230 × $$\frac{30}{100}$$
x + 32 = 69
x = 37
Hence, required number = 37