Question

Example 3.3 : 20 men require 25 days to dig a trench 50 m long, 20 m broad and 1 m der Ke
1
How many days will be required for 60 men to dig a trench 90 m long, 60 m broad and m deep​

Answer 1

plz change the numbers only formula is correct

Answer: Let the required length be x metres.

More breadth, Less length (Indirect Proportion)

More depth, Less length (Indirect Proportion)

More days, More length (Direct Proportion)

Breadth 20 : 50] : : 100 : x

Depth 15 : 10] : : 100 : x

Days 10 : 30] : : 100 : x

∴ 20 × 15 × 10 × x = 50 × 10 × 30 × 100

x = 50 × 10 × 30 × 100/20 × 15 × 10

x = 500 m

Hence,

The length of second trench is 500 m.

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