Question

( 1 ) 30 cows can graze a field in 15 days. How many less/more cows will graze the same field in 10 days?
( 2 ) At a particular time, the length of the shadow of a building whose height is 80 m is 100 m. What will be the height of an electric pole, the length of whose shadow of the same time is 35 m?


please solve both questions fast please please please please help
please

Answer 1

Answer:

Part 1: 45 cows

Part 2: 28m

Step-by-step explanation:

Part 1 :

We will write the formula of the work done,

⇒ Work done = Rate × Time

⇒ Work done = 30 × 15

⇒ Work done = 450

Now we can find the unknown by using same formula,

⇒ Work done = Rate × Time

⇒ 450 = Rate × 10

⇒ Rate = 450 ÷ 10

⇒ Rate = 45 cows

45 cows can graze the field in 10 days.

Part 2 :

We will write it in ratio form,

⇒ Shadow length : Real height

⇒ 100 : 80

Now the ratio for electric pole,

⇒ 35 : x ( x is the 'real height' of the electric pole )

Cross-multiply both ratios and we get the equation,

⇒ 100x = 80 × 35

⇒ 100x = 2800

⇒ x = 2800 ÷ 100

⇒ x = 28

∴ The real height of electric pole is 28m.

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