Q. 134.0( 22 Votes )
If the thickness of a pile of 12 cardboard is 65 mm, find the thickness of a pile of 312 such cardboards.
Answer :
More the no. of cardboards, more will be the thickness. So it is a direct proportion.
Let the thickness be x mm, 
⇒ 12 × x = 65 × 312
⇒ x = 
= 1690 mm = 1m 690mm = 1m 69 cm
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