Twelve boys and n girls sat for a test. The mean of the boys' scores and that of the girls were 5 and 8 respectively. find n if the total score was 180.
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Twelve boys and n girls sat for a test. The mean of the boys' scores and that of the girls were 5 and 8 respectively. find n if the total score was 180.
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Step-by-step explanation:
total number of boys = 12
mean score of boys =5
total girls = n
mean score of girls = 8
according to question
60 + 8n = 180
that implies , 8n = 180 - 60
8n = 120
n = 120/8 = 15
therefore 8 number of girls are seated in the test.
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