5) Gopala mencatat skor 82,91,86 dan \( 88 \) dalam empat kertas ujian percubaan. Berapakah markah yang harus dia capai dalam kertas percubaan kelima untuk mendapatkan purata markah \( 85 ? \)
A. \( 78 \) B. \( 82 \) C. \( 83 \) D. \( 86\)
Pregunta
Answer
Gopala recorded scores of 82,91,86 and 88 in four experimental test papers. How many marks should he achieve in the fifth test paper to get an average of 85 marks?
Answer:
78 marks
\(\frac { 82 + 91 + 86 + 88 + x } { 5 } = 85 : x = 78 \)
Steps
\( \frac { 82 + 91 + 86 + 88 + x } { 5 } = 85 \)
Multiply both sides by \( 5 \)
\( \frac { 5 ( 82 + 91 + 86 + 88 + x ) } { 5 } = 85 \cdot 5 \)
Simplify
\( x + 347 = 425 \)
Subtract \( 347 \) from both sides
\( x + 347 - 347 = 425 - 347 \)
Simplify
\( x = 78\)
Related Questions
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Ms. Smith decided to purchase bags of M\&Ms and Hershey Bars for all of her students. Each M\&M Bag costs \( \$ 3.00 \) , while each Hershey Bar costs \( \$ 2.00 \) . She ended up spending a total of \( \$ 16.00 \) on her purchase of \( 6 \) items. 1. Let x represent the number of bags of M\&M's purchased and let y represent the number of Hershey bars purchased. Write an equation to model the total number of items purchased.