Answer:
3.705
Explanation:
well, 5.78 รท 3.9 = 1.4820 so 0.4 can go into 1.4820 3.705 times. hope this helps :) have a good day :D
Ok so I got you
1. 0.4x + 3.9 = 5.78
2. 0.4x = 5.78 - 3.9 = 1.88
3. 0.4x = 1.88
4. 0.4/ 1.88 = 4.7
5. x = 4.7
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