A survey was conducted on pollution of 525 ponds across some cities. It was found that 230 ponds are polluted by fertilisers (F)(F), 245 ponds are polluted by pesticides (P)(P) and 257 ponds are polluted by pharmaceutical products (Ph)(Ph). 100 ponds are polluted by fertilisers and pesticides, 82 ponds are polluted by fertilisers and pharmaceutical products, 77 ponds are polluted by pesticides and pharmaceutical products.

Find the number of ponds polluted by all types of water contaminants.

Define a relation on the set of 525 ponds such that two ponds are related if both are polluted by fertilisers and pharmaceutical products. Which of the following is/are true?