05/08/13
If you add 3 to my age and divide the sum by 5, you will have my daughter's age. But 3 years ago I was 8 times as old as my daughter was. find their ages now.
I've got (m+3)/5 =d and m-3=8d
My teacher wrote m-3=8(d-3).
But no matter which equations I use. I keep getting decimals, negative numbers, or fractions for the ages.
Please help and explain the...
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05/02/13
Flying with a tailwind a plane averaged 158 km/h. On the return trip the plane averaged 112 km/h with same wind. Find wind & plane speed in still air.
I got as far as plane speed + wind = 158 and plane speed - wind = 112.
But I don't know how to solve the problem.
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05/02/13
Find a 2 decimal place number between 0 and 1 such that the sum of its digits is 13 and such that when the digits are reversed the number is decreased by 0.45.
I understand there is a standard formula for figuring these out, but I don't really understand why.
I think it's something along the lines of 0.1t +0.01h =13 and 0.01t + 0.1h = 12.55.
But I'm...
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