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There are 10 boys and 20 girls in a class. The class has a test. The mean mark for all the class is 60. The mean mark for the girls is 54. Work out the mean mark for the boys

Find the total number of people in the class 10+20=30 find the total number of marks achieved by the class 60x30=1800 since the mean mark for the girls is 54, you can work out the total marks achieved by the...
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Answered by Dessi T. • Maths tutor
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Solve 10x - 7 = 4x + 5

Firstly, we want to gather similar terms. This means that we want to rearrange the equation so that all the x terms are on one side of the = sign and all the constants (the "ordinary" numbers) are ...
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Answered by Mary O. • Maths tutor
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Solve the inequality: x^2 - x < 12

Firstly, the equation should be rearranged to get all the non-zero terms onto one side, with the simplest way of doing this being subtracting 12 from both sides, giving the equation x 2 - x - 12 &lt; 0. Then...
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Answered by Thomas H. • Maths tutor
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What is active transport?

This is a form of movement of molecules. This is the movement of molecules from an area of low concentration to an area of high concentration (against the concentration gradient) across a membrane. As it is ...
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Answered by Zimeng W. • Biology tutor
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Meiosis and mitosis are different types of division in human cells. Compare the two processes by referring to where each takes place and the kind of products that are made.

Meiosis is a mechanism of sexual cell division used to generate gametes, or sex cells, in reproductive organs. For example, generation of eggs in ovaries. By contrast, mitosis is an asexual method of cell di...
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Answered by Megan C. • Biology tutor
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