Red and grey bricks were used to build a decorative wall. the number of redbricks over the number of grey bricks was 5/2. there were 175 bricks used in all. how many red bricks were used?

Asix-sided die of unknown bias is rolled 20 times, and the number 3 comes up 6 times. in the next three rounds (the die is rolled 20 times in each round), the number 3 comes up 6 times, 5 times, and 7 times. the experimental probability of rolling a 3 is 10 %, which is approximately % more than its theoretical probability. (round off your answers to the nearest integer.)