Raju Brought 5 notebook and 4 pens for 148 rupees But He Needed only 4 notebook and 5 pens, it would cost 140 rupees, calculate the price of a pen and that of notebook?
Answers
Answer:
Answer is 16 Rs
Step-by-step explanation:
Let cost of book be x & cost of pen be y
Let cost of book be x & cost of pen be y→ 8x+5y=420;→ 5x+8y=321
Let cost of book be x & cost of pen be y→ 8x+5y=420;→ 5x+8y=321substituting x=y+33 in equation (1) we get :
Let cost of book be x & cost of pen be y→ 8x+5y=420;→ 5x+8y=321substituting x=y+33 in equation (1) we get :cost of 1 book & 2 pens = 45+2(12)= 45+24
Let cost of book be x & cost of pen be y→ 8x+5y=420;→ 5x+8y=321substituting x=y+33 in equation (1) we get :cost of 1 book & 2 pens = 45+2(12)= 45+24Adding = 13x+13y=741;x+y=57 (1)
Let cost of book be x & cost of pen be y→ 8x+5y=420;→ 5x+8y=321substituting x=y+33 in equation (1) we get :cost of 1 book & 2 pens = 45+2(12)= 45+24Adding = 13x+13y=741;x+y=57 (1)Subtracting = 3x-3y=99;x-y-33
Let cost of book be x & cost of pen be y→ 8x+5y=420;→ 5x+8y=321substituting x=y+33 in equation (1) we get :cost of 1 book & 2 pens = 45+2(12)= 45+24Adding = 13x+13y=741;x+y=57 (1)Subtracting = 3x-3y=99;x-y-33y+33+y=57→2y=24⇒y=12
Let cost of book be x & cost of pen be y→ 8x+5y=420;→ 5x+8y=321substituting x=y+33 in equation (1) we get :cost of 1 book & 2 pens = 45+2(12)= 45+24Adding = 13x+13y=741;x+y=57 (1)Subtracting = 3x-3y=99;x-y-33y+33+y=57→2y=24⇒y=12so x=12+33-45
Let cost of book be x & cost of pen be y→ 8x+5y=420;→ 5x+8y=321substituting x=y+33 in equation (1) we get :cost of 1 book & 2 pens = 45+2(12)= 45+24Adding = 13x+13y=741;x+y=57 (1)Subtracting = 3x-3y=99;x-y-33y+33+y=57→2y=24⇒y=12so x=12+33-45=69Rs