Starting from the origin, you do by moving four blocks <em>north</em> over one block <em>east</em><em> </em>[<em>west</em> and <em>south</em> are negatives].
we know that 18 students is 75% of the class and we need to know 100% of the class. to calculate this, divide the 18 students by 75% to work out what 1% of the students equals:
18 ÷ 75 = 0.24
0.24 students = 1% of the class. multiply this number by 100 to calculate 100% of the class: