Because blood comes in one half and goes out the other. Each half of the heart has a lung pumping oxygen to it.
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There are 296 halves in 148, since 148 divided by 1/2 is the same as 148 * 2 = 296.
3/2 divided by 3/2 is 3/2 times 2/3 which is 1.
5/2 divided by 1/4 is 10.
5/2 ÷ 1/4 = 10