The cost of ploughing a field at Rs. $9$ per square metre is Rs. $1872$ . If the breadth of the field is $13$ m, then its length is ___________.

8

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16

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39

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3

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Solution

The correct option is A $16$ m
Total cost $=$ Rs. $1872$
Cost of ploughing $1$ sq. m $=$ Rs. $9$
$∴$ Area of field $= 1872 \div 9 = 208$ sq. m.
$\Rightarrow$ Length $\times$ Breadth $= 208$ sq. m
$\Rightarrow$ Length $\times 13$ m $= 208$ sq. m
$\Rightarrow$ Length $= 208 \div 13 = 16 m$ .

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The cost of ploughing a field at Rs. 9 per square metre is Rs. 1872. If the breadth of the field is 13m, then its length is ___________.

The correct option is A 16mTotal cost=Rs. 1872Cost of ploughing 1 sq. m=Rs. 9∴ Area of field =1872÷9=208 sq. m.⇒ Length × Breadth =208sq. m⇒ Length ×13m=208 sq. m⇒ Length=208÷13=16m.

The cost of ploughing a field at Rs. $9$ per square metre is Rs. $1872$ . If the breadth of the field is $13$ m, then its length is ___________.

The correct option is A $16$ m
Total cost $=$ Rs. $1872$
Cost of ploughing $1$ sq. m $=$ Rs. $9$
$∴$ Area of field $= 1872 \div 9 = 208$ sq. m.
$\Rightarrow$ Length $\times$ Breadth $= 208$ sq. m
$\Rightarrow$ Length $\times 13$ m $= 208$ sq. m
$\Rightarrow$ Length $= 208 \div 13 = 16 m$ .