Question

there are 21000 seats in a stadium, the seats are divided into blocks of either 450 or 400 seats, there are three times as many 450 blocks of seats as there 400, how many blocks of seats are there?

Answer 1

Answer:

Let the x-blocks have 400 seats Then 3х-blocks for 450 seats 400∗x+450∗3x=21000400x+1350x=210001750x=21000x=12400*x+450*3x=21000\ 400x+1350x=21000\ ...