Question

If the cost of 37 pens and 53 pencils together is rupee 320, while 53 pens and 37 pencils together cost rupee 400. The cost of two pens is:

Answer 1

37x+53y=320........(1)

53x+3

$2x =2 (320 \times 37 - 400 \times 53) \div {37}^{2} - {53}^{2} = \\ = 2(11840 - 2000) \div 1369 - 2809 \\ = 2 \times 9840 \div - 1440 = \\ 19680 \div 1440 = - 1968 \div144 = \\ = 13.60$

7y=400... ....(2)

Answer 2

Answer:

See the attached image