Question 1078441
{{{ P = ( M/2 )*3 }}}
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check:
Suppose {{{ M = 12 }}}
{{{ M/2 = 12/2 }}}
{{{ M/2 = 6 }}} 
There are 6 of the 2 minutes periods in 12 minutes
{{{ ( M/2 )*3 = 6*3 }}}
{{{ ( M/2 )*3 = 18 }}}
3 color photos times the number of 2 minute periods
gives me 18 color photos, {{{ P }}}