The base of a rectangle is three times as long as the height. If the perimeter is it, what is the area of the rectangle?
মনে করি, আয়তক্ষেত্রটির উচ্চতা x একক এবং আয়তক্ষেত্রটির ভূমি 3x একক
প্রশ্নমতে, 2(x+3x)=64 [∵2( দৈর্ঘ্য +প্রস্থ) = পরিসীমা]
=2×4x=64
=8x=64
∴x=648=8
অতএব, আয়তক্ষেত্রের ক্ষেত্রফল =(x×3x)=3x2=3×82=3×64=192
When a product is sold for Tk. 18700, the seller loses 15%. At what price mus be sold in order to gain 15%?
At 15% lossIf selling price 85 tk. then cost price=100 tk.∴If selling price 18700 tk. then cost price=100×1870085=22000tkAgain, at 15% profitIf cost price 100 tk. then selling price =115 tk.∴If cost price 22000 tk. then selling price =115×22000100=25300tk∴selling price 25300 tk. (ans)
The cost price of 10 pens is the same as the selli price of a pens. If there is a loss of 40% approximately what is the value of n?
Let, the cost price of each pen is 1 tk. ∴The cost price of n pen is = n tk. Given, selling price of 10 pens = 10 tk. ∴ loss= (n-10) tk. ∴(n-10n×100)%=40% [As, loss%=CP-SPCP×100] =n-10n×100=40 =100n-1000=40n =60n=-1000 ∴n=100060=16.667% ∴n=17%(Approximately) ans.