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Sagot :
We know that the total was 420 birds.
We also know that the ratio of Godwits geese was 20:40, so 2: 4, which after shortening is 1: 2. Now we know that geese is twice the Godwits.
Arrange the relationship:
x + 2x = 420
3x = 420 |:3
x = 140
2x = 2 * 140 = 280
We see that the geese is 280, and 140 Godwits. In total 420.
We also know that the ratio of Godwits geese was 20:40, so 2: 4, which after shortening is 1: 2. Now we know that geese is twice the Godwits.
Arrange the relationship:
x + 2x = 420
3x = 420 |:3
x = 140
2x = 2 * 140 = 280
We see that the geese is 280, and 140 Godwits. In total 420.
Total number of birds = 420
Godwits / Geese = 20 : 40 = 20 /40 = 1 / 2 (40 = 20 * 2 , cancel 20 on numerator and denominator)
2 Godwits = 1 Geese by cross multiplying on both sides
Godwits + Geese = 420
substitute in place of geese 2 Godwits
Godwits + 2 Godwits = 420
3 godwits = 420
godwits = 420 / 3 = 140 * 3 / 3 = 140
geese = 2 * godwits = 2 * 140 = 280
Godwits / Geese = 20 : 40 = 20 /40 = 1 / 2 (40 = 20 * 2 , cancel 20 on numerator and denominator)
2 Godwits = 1 Geese by cross multiplying on both sides
Godwits + Geese = 420
substitute in place of geese 2 Godwits
Godwits + 2 Godwits = 420
3 godwits = 420
godwits = 420 / 3 = 140 * 3 / 3 = 140
geese = 2 * godwits = 2 * 140 = 280
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