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How many baby dinosaurs and adult dinosaurs were there?

each baby dinosaur made 15 paintings and each adult dinosaur made 7 paintings. The entire herd of dinosaurs made 208 paintings in total, and there were 3 times as many baby dinosaurs as adult dinosaurs

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David W. | I'll help you understand math!I'll help you understand math!
4.9 4.9 (63 lesson ratings) (63)
-1
15b + 7a = 208
b = 3a
 
Substitute!
 
15(3a) + 7a = 208
 
Solve for a and plug your answer into the 2nd equation to find b.