1000 Soliders in a fort had enough food for 20 days. But some soldiers were transferred to another fort and the food lasted for 25 days. How many soldiers were transferred?
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Let the number of soldiers transferred be = x
by unitary method
number of soldiers ║ days food lasted
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1000 ║ 20
1000-x ║ 25
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by inverse variation
1000 × 20 = (1000-x) × 25
1000 ×20/ 25 =1000 - x
800 = 1000 -x
x= 1000 - 800
= 200
∴200 soldiers were transferred to another fort.
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