Simple ratio easy points up for grabs
£320 is divided between colin, dan & david so that colin gets twice as much as dan, and dan gets three times as much as david. how much does dan get?

Colin gets twice as much as Dan

Colin = Dan * 2

Dan gets three times as much as David

Dan = David * 3

Put this is terms of a ratio.

Colin:Dan:David

6:3:1

6 + 3 + 1 = 10

320 / 10 = 32

David = 32 * 1 = £32

Dan = 32 * 3 = £96

Colin = 32 * 6 = 96 * 2 = £192

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.

i think it is 70

step-by-step explanation: