The answer should not depend on which machine or which pencil you use to
find it. If you work a problem two different ways and get two different answers,
then at least one of them is wrong, and there's a pretty good chance that both
of them are.
(9.99 of anything) + (1.11 of the same thing) = 11.1 of them
9.99 (x 10^-2) + 1.11 (x 10^-2) = <em>11.1 (x 10^-2)</em> .
Can we do any more with that ?
10^-2 = 1 / 10^2 = 1 / 100 .
11.1 x 10^-2 = 11.1 / 100 = <em>0.111</em>
So you divide 50 by 2 so there are 25 before him
7 Days
25/5 cups of bird seed to start with and subtract 3/5 from it until you run out of bird seed
If he makes the same number of cakes each day he make 6 cakes a day because 42/7 is 6, and 42 in 7 days because 6*7 is 42