Question

Please someone help me with steps!

Answer 1

I think 96 I am not sure

Answer 2

96

Explanation:

The formula for average =
`\frac{Sum \hspace{0.15cm} of\hspace{0.15cm} Items}{No.\hspace{0.15cm} of \hspace{0.15cm} Items}`

After taking 3 tests, the average is 88.

∴ 88 = Sum of Items / 3

Sum of Items = 88 x 3

= 264

This means Lenny's total score after 3 tests is 264.

We now have to calculate how many marks needs to be added to 264 so that after four tests, the average is 90.

Now the number of items (tests) = 4, and average = 90.

Let the marks required in 4th test =
`x`

∴
`(264 + x)/(4) = 90`

264 +
`x` = 360

`x` = 360 - 264

= 96