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lutik1710 [3]
3 years ago
8

A student missed 10 problems on a history test and received a grade of 17%. If all the problems were of equal value, how many pr

oblems were on the test?
Mathematics
1 answer:
belka [17]3 years ago
8 0

Answer:

12 problems

Step-by-step explanation:

All problems were of equal value

Let x be the number of problems in the test

We apply a rule of three

x -------------------------------  100%

(x-10) --------------------------- 17%

(x-10)*100%/(x)   = 17%

(x-10)/(x)   = 0.17

(x-10)   = 0.17*x

0.83*x = 10

x = 12.05

x = 12 problems

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Step-by-step explanation:

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3 years ago
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Solution:

Given:

2(10-a^2)+7a

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