Thread: mathematics tests

Just before her last mathematics test this year Rajee’s average mathematics
mark was 89%. She scored 97% in the last test and her average is now 90%.
The number of mathematics tests she wrote this year is__________

In that given sum is....

89x + 97y = 90 (x+y)

89x + 97y = 90x + 90y

7y=x

So any number satisfied this equation will be the result...

Example (1,7) (2,14) (3,21) ......

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suresh

It is very clear that values of Y is 1.

The number of mathematics tests she wrote this year is 8 (7+1).