Solve 3(x-2)=21
This question can be solved in two ways. One way is to divide the whole equation, both sides by 3, which gives x-2=7. Then add 2 to both sides to give x=9. Another way is to work out the left hand side of the equation first, which gives 3x-6=21. Then add 6 to both sides to give 3x=27. x can then be worked out by 27/3=9.
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There are 300 students at a school who have been asked to attend assembly. 1/10 students are sat on chairs, 85% of students are sat on the floor, the rest do not attend assembly. How many students did not attend assembly?
