The mass of 3 dictionaries and 2 textbooks is 8 kg. The mass of 3 dictionaries and 3 textbooks is 9 kg. Find the mass of 5 textbooks. solution?
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Answered by
2
the mass of 5 textbooks is 5kg.
cynnjanuary:
3d+3t=9
use elimination
1t=1
5*t=5
before a journey , there were 40 litres of petrol in the tank of a car.After travelling 150 km, 25 litres of petrol were left in the tank.How much further could the car travel? Solution?
250 more km
40l - 25l= 150km
15l=150km
1l=10km
25km*1l=250km
Answered by
4
let the no. of dictionary be (x )
no. of text book be (y)
now by above info.
two eq. can be formed
3x + 2y = 8. and
3x + 3y = 9
now by elimination method
y = 1 = mass of 1 text book
i.e. mass of 5 textbooks =5
no. of text book be (y)
now by above info.
two eq. can be formed
3x + 2y = 8. and
3x + 3y = 9
now by elimination method
y = 1 = mass of 1 text book
i.e. mass of 5 textbooks =5
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