A school allows either all white uniform or a combination uniform where one of the trouser or shirt is black and the other is white.In all there are 15 combination uniforms, 12 white trousers and 13 white shirts.What is the total number of students in the school
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Answer:
total number of students in the school = 20
Step-by-step explanation:
Total Combination = 15
White Trouser = 12
White Shirts = 13
Let say X is the number of all White uniform
=> X Shirt & X trouser for all White
Then White Trouser + Black Shirt = 12 - X
& White Shirt + Clack Trouser = 13 - X
Total Combination = 12 - X + 13 - X = 15
=> 25 - 2X = 15
=> 2X = 10
=> X = 5
all White uniform = 5
Total number of students = All white + combination
= 5 + 15
= 20
total number of students in the school = 20
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