<em>If two pairs of corresponding angles in a pair of triangles are congruent, then the triangles are similar. We know this because if two angle pairs are the same, then the third pair must also be equal. When the three angle pairs are all equal, the three pairs of sides must also be in proportion.</em>
54 quarter hours ... 36 semester hours
87 quarter hours ... x semester hours = ?
If you would like to know how many semester hours credit would a student receive after completing 87 quarter hours, you can calculate this using the following steps:
54 * x = 87 * 36
54 * x = 3132 /54
x = 3132 / 54
x = 58
Result: A student with 87 quarter hours is given credit for 58 semester hours.
If 30% were perfect, 70% were not perfect. So we know that 70% of the total number of photographs is 210.
p(70/100)=210 multiply both sides by 100
70p=21000 divide both sides by 70
p=300
So there are 300 photographs in all.