Hi - Please treat this as urgent. Wondering if I can get examples/Samples/Animated Video to cover the concepts for the following scenario -

1) 20 men take 50 days to complete a tasks .How many days 10 men will take? (In this example - key is 1 man will take more days and hence for 10 men it is (50*20)/10 ) . Below example is slightly diff -

2) I can buy 50 pencil in 100 rupees. How many pencil can Ibuy in 30 rupees? (In this example - identifying a unit will require a dvidie unlike for above example identifying days for 1 men will require multiply).

Hope this is clear. Need animated way of explaining this to my son.

Rgds

Pradeep M

MEN | DAYS |

20 | 50 |

10 | x |

Since men and days are inversely proportional, so we get

20 $\times $ 50 = 10 $\times $

*x*

$\Rightarrow 1000=10x\phantom{\rule{0ex}{0ex}}\Rightarrow x=100$

(2).

pencils | amount(Rupees) |

50 | 100 |

30 | x |

Since amount and pencils are directly proportional, so

$\frac{50}{30}=\frac{100}{x}\phantom{\rule{0ex}{0ex}}\Rightarrow 50x=3000\phantom{\rule{0ex}{0ex}}\Rightarrow x=\frac{3000}{50}=60$

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