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All the answers on page 15 of the math classroom exercise book for the sixth grade of primary school
In the ratio of 3: 4 = 0.6: 0.8, if the last term of the first ratio is added with 5 to make the equation unchanged, how much should the last term of the second ratio be added?

3:(4+5)=0.6:0.8

9*0.6=X*3

5.4 = 3 times

X=5.4 divided by 3

X= 1.8

1.8-0.8= 1

A: add one to the second item.