Answers

2014-08-06T17:31:44+08:00
Is it 10?
try to use ratio.......
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2014-08-06T18:03:53+08:00
Using fraction, 10 workers is a whole number (1). Adding five more workers, the result will be 1 \frac{1}{2} , as based from the original. The answer is 9.

Solution :
10 : 18
Adds 5 workers (Left part of the ratio)
(15 : 18) \neq (10 : 18)
( 1\frac{1}{2}  \neq (1)

15 is 150% of 10.

18 ÷ 2 = 9

Therefore, 15 workers can assemble 9 car engines in 9 days.
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