edirsonperez3073
03.11.2020 •
Mathematics
Mary is five times as old as Fred. In three years Mary will be 4 times as old as Fred. Find their present ages?
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Ответ:
ans
here let mary age be x and fred be y
1st equation
x= 5y
2nd equation
x+3 =4(y+3)
now from 1st equation putting value of x in equation 2
x+3 = 4y+12
5y+3 = 4y +12
y = 9
so fred is 9 and mary is 45
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