In a zoo, 21% of the animals are reptiles and 11% are birds. There are a total of 1,500 animals in the zoo. Which proportion can be solved for r, the number of reptiles in the zoo?
1500 * .21 = ?
To solve for the number of reptiles in the zoo (denoted by 'r'), we can set up a proportion based on the given percentages:
r (number of reptiles) / 1500 (total number of animals) = 21% (decimal form)
Since 21% can be written as the decimal 0.21, the proportion becomes:
r / 1500 = 0.21
To solve for 'r', we can cross-multiply and divide:
r = 0.21 * 1500
Now, we can calculate the value of 'r':
r = 315
Therefore, the number of reptiles in the zoo is 315.