My brother is in 5th grade and this Math question is in his book. I can't arrive at the answer. I personally think the question might be incomplete, but maybe you guys can solve it. Here's the question:

Jenny saved 360 pesos of her monthly income and spent 1/6 of the rest on transportation. After spending 240 pesos on clothes, she found that she still had 1/3 of her income left. How much was her monthly income?