Three tins, A, B and C, each contain buttons. Tin A contains x buttons. Tin B contains 3 times the number of buttons that tin A contains. Tin C contains 5 fewer buttons than tin A. The total number of buttons in the three tins is 115 Work out the number of buttons in tin C.

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212