A recipe for rice and lentils calls for 1 L of broth for every 250 g of lentils and 250 g of rice.
How much rice do you need if you use 2.5 L of broth?

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?