Problem: I Three types of pencils J, K and L, cost Tk. 0.05, Tk. 0.10 and Tk. 0.25 each, respectively.If a box of 32 of these pencils costs of total a Tk. 3.40 and if there are twice as many Kpencils as L pencils in the box, how many J pencils are there in the box?
View all: NATIONAL BANK(AB) | WRITTEN QUESTION (MATH) SOLVE | 1996
Correct Answer: ans. 14
Explanation:
Suppose, in the box K pencils are x in numbers
L pencils are 2x in numbers
j pencils are (32 – 3x) in numbers
According to the question.(32 -3x) x 0.05 + 2x 0.10+x$\times$0.25 = 3.40
=>$\frac{(32-3x)\times 5}{100}$+$\frac{2x}{10}+\frac{25x}{100}$=$\frac{34}{10}$
x=6
The number of J pencil in the box are =32-3x= 32-3 x 6 = 14
