a sum of rupees 800 is in the former of denominations of Rs.10 and Rs.20 if the total number of notes be 50 find the number of notes in each type
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let X be the number of 10 rupees note and Y be the number of 20 rupees note
according to question X + Y = 50 eq1
again 10X + 20Y = 800
X + 2Y = 80 eq 2
subtracting eq 1 and 2
X + 2Y -(X + Y) = 80 - 50
X + 2Y - X -Y = 30
Y = 30 and X = 50 -30 = 20 means 20, 10 rupees note and 30 , 20 rupees note
according to question X + Y = 50 eq1
again 10X + 20Y = 800
X + 2Y = 80 eq 2
subtracting eq 1 and 2
X + 2Y -(X + Y) = 80 - 50
X + 2Y - X -Y = 30
Y = 30 and X = 50 -30 = 20 means 20, 10 rupees note and 30 , 20 rupees note
pkvortex08:
yep
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