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solniwko [45]
3 years ago
6

Mark had 14 problems wrong on his test. his score was 72% correct. how many problems were on the test?

Mathematics
1 answer:
ella [17]3 years ago
4 0
Let x = number of problems on test
If he got 14 wrong, then x - 14 is the number correct.
\frac{x-14}{x} = .72

x - 14 = .72x
.28x - 14 = 0
.28x = 14
x = 50

The test consisted of 50 problems.
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Which figure has the greatest perimeter?​
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Figure B: 3•6=18

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Let the present age of Christopher be 'C'.

Let the present age of Ishaan be 'I'.

From the given data, we can form equations which will help us solve the problem.

Christopher is 20 years younger than Ishaan. This means:

C = I - 20                  . . . (1)

Fourteen years ago, Ishaan would have been (I -14) years old and Christopher (C - 14) years old.

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So, Ishaan is 49 years old.

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