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A boy got 50% of the questions on the test correct. If he had 10 questions correct out of the first 12, and 1/4 of the remaining questions correct, how many questions were on the test

Respuesta :

nrajpal

Answer:

its 28

Step-by-step explanation:

28-12=16.

16/4=4

10+4=14.

Check 14/28= 1/2

There are 28 questions on the test.

He got 50% of the test correct. He had 10 questions correct out of the first 12 and 1/4 of the remaining questions correct.  

let

x = number of questions

Therefore,

correct answer = 50% of x

10 + 1/4 (x - 12) = 0.5x

10 + 0.25x - 3 = 0.5x

7 = 0.5x - 0.25x

7 = 0.25x

x = 7 / 0.25

x = 28

Therefore, they are 28 questions on the test.

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