Two positive numbers are in the ratio 4:7 and the different of the two numbers is 12 . Find the two numbers Math question please help?

2016-08-29 3:29 pm

回答 (2)

2016-08-29 11:06 pm
Sol
(1) a:b=4:7,a-b=12
a:b=4:7
a/4=b/7=p
a=4p,b=7p
a-b=4p-7p=12
p=-4
a=-16,b=-28 (不合)
(2) a:b=4:7,b-a=12
a:b=4:7
a/4=b/7=p
a=4p,b=7p
b-a=4p-7p=12
p=4
a=16,b=28
2016-09-26 1:08 am
16,28


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