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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.

Question: 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.Answer: total mar...

Answered by Sajid K. • Maths tutor

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Solve the simultaneous equations.

x= 9/2y= -3/2

Answered by Shivam P. • Maths tutor

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expand out the bracket (2m - 3)(m + 1).

claw technique: multiply each 'thing' in the first bracket with each 'thing' in the second bracket.2m² + 2m - 3m -3then collect the like terms2m² -1 -3

Answered by Abigail P. • Maths tutor

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Liv and Laura win a lottery of £350,000 and decide to split their winnings according to the ratio 3:4. Work out how much each person receives.

the total number of parts of the ratio is 3+4 = 7. liv will therefore receive 3/7 parts of the total amount, so liv will get 3/7 x 350000 = 150,000Laura will receive 4/7 parts of the total amount, so laur...

Answered by Abigail P. • Maths tutor

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write the vector equation of a line passing through (1,-1,2) and (2,2,2).

The vector from (1,-1,2) to (2,2,2) will have direction (2,2,2)-(1,-1,2) which is (1,3,0) so the vector equation is r =(1,-1,2) + s(1,3,0) where s is a scalar.

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