Answer:
No. of 3 pound weights = (10X + 10Y - 50) / 7
No. of 10 pound weights = (X + Y) - [ (10X + 10Y - 50) / 7 ]
Step-by-step explanation:
Assuming all are 10 pound weights
Total mass of weights = 10 (X + Y) = 10X + 10Y
Difference in assumed mass and actual mass = 10X + 10Y - 50
Difference in mass of each type of weight = 10 - 3 = 7
No. of 3 pound weights = (10X + 10Y - 50) / 7
No. of 10 pound weights = (X + Y) - [ (10X + 10Y - 50) / 7 ]
