Chen and Dave divide £350 in the ratio 3:4
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Work out how much money Dave gets

Hello people, i have a math question that i need with, me, i will give the correct one brainiest, and for the other correct people, a and 5 stars.

In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.