book Maths Puzzle Numerical Ability

my questions is
solve the proportion
8/y = 4/7

thanks for the help

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book Other Question

is -0.4 rational or irrational? Can someone help me with this problem?

A school had 900 students at the start of a school year. If there is an enrollment increase of 7% by the beginning of the next year, what is the new enrollment?
Thanks,
Lyn