The coach assigned Laura, Elvis and Clark some exercises. The ratio of the number of exercises given to Laura to the number of exercises given to Clark is 5:7. The ratio of the number of exercises given to Elvis to the number of exercises given to Clark is 4:5.

(a) What’s the ratio of the number of exercises given to Laura to the number of exercises given to Elvis to the number of exercises given to Clark?

(b) If the number of exercises given to Clark is 140, what’s the number of exercises given to the other two students?

Laura:

Elvis: