mazz8643 mazz8643

14-07-2017
Mathematics

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My sister is 15 years older than i am. the sum of our ages is 41. find our ages

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texaschic101 texaschic101

14-07-2017

x = you, and y = ur sis

x + y = 41
y = x + 15

x + (x + 15) = 41
2x + 15 = 41
2x = 41 - 15
2x = 26
x = 26/2
x = 13 <== u r 13

y = x + 15
y = 13 + 15
y = 28 <== ur sis

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