I've been trying to figure this one out for hours, anyone that can help me...I'd be eternally grateful.
Most mathematics professors love to invest their hard earned money. A recent survey of 150 math professors revealed that
111 invested in stocks;
98 invested in bonds;
100 invested in certificates of deposit;
80 invested in stocks and bonds;
83 invested in bonds and certificates of deposit;
85 invested in stocks and certificates of deposit;
9 did not invest in any of the three.
How many mathematics professors invested in stocks and bonds and certificates of deposit?
Thank you so much!!