Rubber, wood, paper or plastic
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Just use the memory key A is for ash. Anything that leaves an ash is a class A fire. So paper, wood, cloth would all be good examples of class A fires. Class B is liquids such as gasoline or oil. Class C is electrical fires and class D is a special class for metals that burn such as magnesium.
Class B
Four firefighters were discussing the number of fires they extinguished for the month of February. Rafael extinguished 25% fewer fires than Louis in February. William extinguished 50% more fires than Rafael. Albert extinguished 20% fewer fires than Rafael and William combined. If Louis extinguished 6 fires per week, how many fires did all four men extinguish during the entire month?
No, it is not. The word fires is a plural noun or a verb form meaning shoots or burns.
No, binary numbers don't consist of ones and twos, they are ones and zeros.