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of the pupils in Year 9 say their favourite colour is red.
There are 180 pupils in Year 9.
How many students said red is their favourite colour?

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

Find the nonpermissible replacement for binthis expression.b2/5b +5

Acertain volume of water contains 100000 hydrogen atoms and 50,000 oxygen atoms how many hydrogen atoms are in a volume of water containing 4 million oxygen atoms