If we have 12+11+10 = 33 bulbs then;
12/33 is red
11/33 is blue
10/33 is yellow
Similarly if we have 4752 bulbs;
Number of red bulbs `= (12/33)xx4752 = 1728`
Number of blue bulbs `=(11/33)xx4752 = 1584`
Number of yellow bulbs `=(10/33)xx4752 = 1440`
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