if the cost of 7 pencil is rs 30. so what is the cost of 3 pencil

1.	if the cost of 7 pencil is rs 30. so what is the cost of 3 pencil
Answer» If the cost of 7 pencils is 30rs then the cost of 1 pencil is 7/30=0.233 If 3 pencils cost Rs 7, then 1 pencil should cost 7/3 = 2.333Rs. Therefore 5 pencils should cost 5x2.333Rs = 11.665Rs. 21/30=.7 is the correct ans ok Let cost of pen=x cost of pencil=ythen 5x+10y=30and x=3+y => subtituting in the first equation5(3+y)+10y=3015+15y=3015y=15y=1x=3+y => x=3+1=4 cost of pen =4 cost of pencil =1 7 pencil is rs 30 than 1 pencin is rs 4.28 than 3 pencin =12.84 rs 12.857 is the correct answer cost of 7 pencil is 30cost of 1 pencil is 30÷7=4.285coat of 3 pencil is =3×4.285=12.857 12.857 is A correct answerplz mark as best

Answer»

If the cost of 7 pencils is 30rs then the cost of 1 pencil is 7/30=0.233

If 3 pencils cost Rs 7, then 1 pencil should cost 7/3 = 2.333Rs. Therefore 5 pencils should cost 5x2.333Rs = 11.665Rs.

21/30=.7 is the correct ans ok

Let cost of pen=x cost of pencil=ythen 5x+10y=30and x=3+y => subtituting in the first equation5(3+y)+10y=3015+15y=3015y=15y=1x=3+y => x=3+1=4

cost of pen =4 cost of pencil =1

7 pencil is rs 30 than 1 pencin is rs 4.28 than 3 pencin =12.84 rs

12.857 is the correct answer

cost of 7 pencil is 30cost of 1 pencil is 30÷7=4.285coat of 3 pencil is =3×4.285=12.857

12.857 is A correct answerplz mark as best

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