The area of a rectangular playground is 420 sq. m, If the length is increased by 7 and breadth is decreased by 5, the area of the rectangular playground remains the same, find the length and breadth of the rectangular playground.

Area = 420 sq m

length x breadth = 420

(l + 7)(b -5) = 420

lb = (l+7)(b-5)

lb = lb - 5l + 7b - 35

-5l + 7b - 35 = lb - lb

7b - 5l = 35

7b = 35 + 5l

b = = 5 + m

-5l = 35 - 7b

l =   = - 7 m

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

step-by-step explanation:

if you want to separate 54 into 6 individual tiers then you need to divide if you want to separate 54 into 6 individual tiers then you need to divide 6 and 54.

if you divide 9 by 6 you will get 54.

- hope i .