Find A if 30% of A equals 30% of 30 plus 30​

Combined megan and kelly worked 60 hours. kelly worked twice as many hours as megan. how many hours did they each worked?

The annual snowfall in a town has a mean of 38 inches and a standard deviation of 10 inches. last year there were 63 inches of snow. find the number of standard deviations from the mean that is, rounded to two decimal places. 0.44 standard deviations below the mean 2.50 standard deviations below the mean 0.44 standard deviations above the mean 2.50 standard deviations above the mean

X+y=-4 x-y=2 use elimination with adding and subtraction