Student are knitting scarcer for a fund-raiser. elaine can kinit 4 scarves in 20 days. mario can knit 2 more scarves than elaine can in 40 days .what is the difference in the time it takes each of them to lint scarf? explan your answer

Elain can knit 4 scarves in 20 days. In 40 days, she would knit 8 scarves.

If Mario can knit 2 more scarves than she can in 40 days, then he can knit 10 scarves.

Divide the days by the scarves, to find that Elain knits one scarf in 5 days, and Mario knits one scarf in 4 days.

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50 % is the answer !