Both a and b are non-zero natural numbers. If a÷5 is 1=b ×4 is 1, then A > B .. (error)

When the diameter of a circle is tripled, its area is expanded to six times. (error)

After two ropes with a length of 1 meter are cut by 4/5 and 4/5 meters respectively, the remaining lengths are equal. (right)

The former term and the latter term of the ratio are multiplied or divided by the same number at the same time, and the ratio remains unchanged. (error)