To find the weight of the oldest gorilla in the zoo, b, you can use the equation 2b – 15 = 605. Plug the weight of each gorilla into the equation to check which value makes the equation true.

Sophia | 318 |  2(318) - 15 | False

George | 417 |  2(417) - 15 | False

Nancy | 310 | 2(310) - 15 | True

Hank | 136 |  2(136) - 15 | False

Paula | 62 | 2(62) - 15 | False

Gavin | 24 |  2(24) - 15 | False

Step-by-step explanation:

With Sophia, her equation is 2(318) - 15. That equals 621, not 605.

With George, his equation is 2(417) - 15. That equals 819, not 605.

With Nancy, her equation is 2(310) - 15. That equals 605.

With Hank, his equation is 2(136) - 15. That equals 257, not 605.

With Paula, her equation is 2(62) - 15. That equals 109, not 605.

With Gavin, his equation is 2(24) - 15. That equals 33, not 605.

answer: 7270

step-by-step explanation:

answer: for each 3 girls there is 2 boys . 3: 2

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