8500 m is much longer.
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8500 m
8500 metres = 8500/1 metres
40% of 8500 = 40% * 8500 = 0.4 * 8500 = 3400
Designate the larger number as l and the smaller number as s. Then l + s = 47 and l - s = 15. From the second of these two equations, s = l - 15; substituting this value into the first equation results in l + l - 15 = 47 or 2l = 47 + 15 = 62, or l = 31.
20% of 8500 pounds= 20% * 8500= 0.2 * 8500= 1,700 pounds