Because the SI units are based on the power of 10 but the imperial units are not
If the ratio is 6:7 the students should divide nicely into 6+7=13 parts. Six of those parts are girls, seven of those parts are boys.
364 / 13 = 28
So 6 × 28 = 168 girls
Answer: 168
Check:
7 × 28 = 196 boys
168 + 196 = 364, good
I think the answer is C. 45 units
Divide both the numerator and denominator by 9 to get;
Convert the improper fraction to a mixed number;