Class A has X students and class B has Y students. The average of the test scores of class A is 80, and the average of the test scores of class B is 90. When the scores of class A and B are combined, the average score is 88. What is the ratio of X to Y?
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Answer:
1:4
Step-by-step explanation:
total marks/student = average
total marks = average x student
A student marks = 80X
similarly, B students marks = 90Y
given,
80X+90Y/X+Y=88
80X+90Y=88X+88Y
8X=2Y
X/Y=2/8=1/4
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