Im pretty sure that the answer is 3225. because i did 425 × 3 since the dude did the workout three times. and i also multiplied 650×3 since he did the workout 3 times again. and the sum of both equations is 1950 and 1275. i just added them together and got 3225
A geometric sequence is a sequence in which there is a common ratio between any two consecutive terms. In this case if X:Y:Z are in the ratio of 2:7:8 the multiplying by a constant k, we have X=2k, Y= 7k and Z=8k. Then if X, Y-12, Z form a Geometric sequence, it means X/Y-12=Y-12/Z which is the same as 2k/7k-12=7k-12/8k if we cross multply, we get 16k²= 49k²-168k +144 33k²-168k+144 =0 solving for k k = 4 or 1.091 if we take the whole number to find the values of X,Y and z, X= 8, Y= 28 and Z=32
