## Formula for Solving Chain Rule Easily

m - Men/labour

d - Days

t - Time

w - part of work done/ wages

a - Amount earned

f - Food consumed/Milk used/coal required Machines/Diesel required for pumps.

## Chain Rules Examples

**Question 1: **A machine weaves 0.75 meter of cloth every second. Approximately, how many seconds will it take for the weave 20 meters of cloth?

**Solution:**

= 0.75 m , = 20 m

= 1 s , = ?

= sec

**Question 2: **30 men can complete a piece of work in 15 days. In how many days will 25 men complete the same work?

**Solution:**

= 30 , = 25

= 15 days , = ?

= 18 days

**Question 3: **12 boys, working 3 hours a day can complete a work in 20 days. How many hours a day must 18 boys work to complete the same work in 10 days?

**Solution:**

= 12 , = 18

= 3 Hrs , = ?

= 21 days , = 10 days

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