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Formula for unitary method, direct variation and percentage.
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Unitary method:
If n men complete work in d days, m men will do that work in how many days?
ans = n d / m
if a bus takes h hours to travel d distance, then how much time it takes to travel distance of x ?
ans = x h / d
Direct variation:
if m men can do x amount of work, then n men can do how much work?
ans = x n / m
like: x1 / x2 = w1/ w2
if a car travels x km in m hours, how much it will travel in n hours ?
ans = n * x / m
Percentage :
if there are x boys, and y girls in a class, the percentage of boys is
x / (x+y) * 100
If n men complete work in d days, m men will do that work in how many days?
ans = n d / m
if a bus takes h hours to travel d distance, then how much time it takes to travel distance of x ?
ans = x h / d
Direct variation:
if m men can do x amount of work, then n men can do how much work?
ans = x n / m
like: x1 / x2 = w1/ w2
if a car travels x km in m hours, how much it will travel in n hours ?
ans = n * x / m
Percentage :
if there are x boys, and y girls in a class, the percentage of boys is
x / (x+y) * 100
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