What is black and white and has lots of problems

In a math book we use blank ink with white pages. Thus, it is a math test.

Given information:

Black and white and has lots of problems.

As per given in question, A test is prepared to check the knowledge obtained by a person during the study time. It was performed before the test presentation. Well, a math book can have black ink with white pages but also a math test can have black and white combination.

It is said to be full of problems because it is made to solve exercises on different topics. And it is said to be black and white because normally the sheets are white and the ink is black.

Therefore, it is a math test.

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The answer is: A math test

Step-by-step explanation:

A test is designed to assess the knowledge obtained by a person during the study time that was performed before the test presentation.

It is said to be full of problems because it is made to solve exercises on different topics.

And it is said to be black and white because normally the sheets are white and the ink is black.

(sin 42)/31. = sinx)/37

sinx = 37 (sin42)/31

= 37× 0.66/31 = 0.787

x= 51.9

other angle opposite to y = 180-51.9-42

= 180- 93.9 =86.1

so

sin42)/31 = sin 86.1)/y

0.021 = 0.997 /y

y= 0.997/0.021 =47.47