Anand bought a total of 30 white and brown pens for
a total of Rs.32. The cost of each white pcen is 70
paise more than the cost of each brown pen. Which
of the following represents a possible value of the
cost of each brown pen (in paise)?
(1) 40
(2) 35
(4) 50
(5) 60
Step-by-step explanation:
Answer is 60 paise. Let no. of brown pens be x then no. of white pens-30-x let y be the cost of brown pen.
xy+(30-x)(y+.7)=32 30y-0.7x=11 now x is an integer y=(11+0.7x)/30 for x=10 y=60 paise.
Step-by-step explanation:
Let the cost of each brown pen be b paise, cost of each white pen =(b + 70) paise. Suppose Anand bought B brown pens. He must have bought (30 -B) white pens.
Total cost =bB+ (30 -B) (b + 70)
30b -70B+ 2100 =3200B=31107b.
Among the given choices, B has a feasible value only when b =60.