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A school has a number of students. One is chosen at random; the probability that the student is female is 2/5. Knowing that there are 174 male students, work out the total number of students in the school.

This is a simple yet standard GCSE question, especially in non-calculator papers. The solution is simple: if the student is picked at random, then the probability 2/5 must represent a ratio where the other s...
AM
Answered by Adam M. • Maths tutor
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Explain processes of erosion that occur in a river

The first erosional process that occurs in a river is hydralic action, which is where water is forced into cracks in the river bed and channel which compresses trapped air, making the cracks larger which can...
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Answered by Olivia S. • Geography tutor
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Outline two ways in which belief in a just God has an impact on Christians today. (4 marks)

Belief in a just God encourages Christians to act more fairly towards others. This is because they believe they have experienced God's justice and they want others to experience it as well. Christians believ...
RK
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How to respond to an extract question (GSCE English Literature)

You'll have to answer 30 mark extract questions in your exams on Shakespeare, the 19th-century novel, and on modern texts. Whilst these questions might seem intimidating, don't worry - they're manageable if ...
MD
19453 Views

Given the balanced equation: MgCO3 + 2HCl --> MgCl2 + H2O + CO2, if 5 grams of MgCO3 is used, what volume of CO2 is produced? (molar mass of MgCO3 is 84.3 g/mol)

This question can be split up into two parts, and uses two key equations: It's always a good idea to look at what information we have been given already, and work out what we can do with it! In this question...
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Answered by Angus B. • Chemistry tutor
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