The ratio of SAMSUNG and iphone is 3:4 respectively. The average number of samsung and iphone is 350. What is the number of iphone?

To solve this problem, we need to follow these steps:

1. First, we need to understand that the ratio given is 3:4, which means for every 3 Samsung phones, there are 4 iPhones.

2. The average number of Samsung and iPhone is given as 350. This average is obtained by adding the number of Samsung phones and iPhones together and then dividing by 2 (since there are two types of phones).

3. Let's denote the number of Samsung phones as 3x and the number of iPhones as 4x.

4. According to the problem, (3x + 4x) / 2 = 350.

5. Solving this equation, we get 7x / 2 = 350.

6. Multiplying both sides by 2, we get 7x = 700.

7. Dividing both sides by 7, we find that x = 100.

8. Now, we know that the number of iPhones is 4x, so substituting x = 100, we get the number of iPhones = 4 * 100 = 400.

So, the number of iPhones is 400.