Question

answer the above question​

Answer 1

Answer:

Let the length of the playground be  l and breadth be b

Thus, lb=420  

∴l=  b 420 ......(1)

Length is increased by 7m and breadth is increased by 5m

∴(l+7)(b−5)=420

(  b 420 +7)(b−5)=420.........From (1)

(420+7b)(b−5)=420b

420b+7b  2 −35b−2100=420b

7b  2  −35b−2100=0

b  2  −5b−300=0

b  2 −20b+15b−300=0

(b−20)(b+15)=0

b=20,−15

Taking only positive value of b

Thus, l=  

420 /20

​  

=21m

Hence, length =21m and breath =20m

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Answer 2

Step-by-step explanation:

length=21 breadth=20

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