Question

Ni Hua is an adventurous traveler. He skydives twice in every island he visits and skydives thrice in every peninsula he visits. In the last decade, Ni Hua went skydiving a total of 45 times in the 19 islands and peninsulas that he visited.

Answer 1

What is the question?

Answer 2

Let Ni Hua visited x island and y peninsulas.

we are given that

Ni Hua went skydiving a total of 45 times in the 19 islands and peninsulas that he visited.

So we can write

`x+y=19......(i)`

`2x+3y=45....(ii)`

Now solve these two equations togethere using substitution as below:

`2(19-y)+3y=45\\ \\ 38-2y+3y=45\\ \\ y=45-38\\ \\ y=7`

So we can write
`x=19-7=12`

Hence Let Ni Hua visited 7 island and 12 peninsulas.