Question

What percent is 400 g of 4 kg
Solve x-5\3 = x-3/5
Find x if 0.5℅ of x is 45

Answer 1

1) we know that 1 kg = 1000g

= 400g/4kg

= (400g/4000g )×100

= (1/10)×100

= 0.1×100

2) (x-5)/3 = (x-3)/5

cross multiply
5(x-5) = 3(x-3)

5x - 25 = 3x - 9

5x -3x = 25-9

2x = 16

x = 16/2

x = 2


3)0.5% of x = 45

x×0.5/100 = 45

x×0.5 = 45×100

0.5x = 45000

x = 9000



= 10%