The oil pipeline passes by three villages A, B, C. In the first village, 30% of the original amount is drained

The oil pipeline passes by three villages A, B, C. In the first village, 30% of the original amount is drained, in the second – 40% of the amount that will go to village B, and in the third – 50% of the amount that will reach the village C. percent of the original amount of oil reaches the end of the pipeline?

1. Determine how many percent of oil reaches village B:

100 – 30 = 70%;

2. Determine how many percent of oil is discharged in village B. We take this percentage for a and make up the proportion:

70% – 100%, and% – 40%;

70: a = 100: 40;

a = (70 x 40): 100;

a = 28%;

3. Determine how many percent of oil reaches the village C:

70 – 28 = 42%;

4. Determine how many percent of oil is discharged in the village C. We take this percentage for a and make up the proportion:

42% – 100%, and% – 50%;

42: a = 100: 50;

a = (42 x 50): 100;

a = 21%.

5. Determine how many percent of oil reaches the last village:

42 – 21 = 21%.

Answer: 21% of the oil reaches the last village.