by aparna
(chennai)
a man bought 66 kgs of 3 types of fruits namely banana, oranges and apple. The ratio of banana to oranges is 4:5 and that of oranges to apples is 2:3 Find out how many kgs of apples were bought
Let x be number of Banana
Let y be number of orange
let z be number of apple
x + y + z = 66
x/y = 4/5
After crossmultiplication, 5x = 4y.
Thus, x = 4y/5
y/z = 2/3
After crossmultiplication, 2z = 3y.
Thus, z = 3y/2
Replace x and z into x + y + z = 66
4y/5 + y + 3y/2 = 66
(8y + 10y + 15y)/10 = 66
33y/10 = 66
33y = 660, so y = 20
There are 20 kg of oranges
Since z = 3y/2, z = (3 * 20)/2 = 60/2 = 30
There are 30 kg of apples
Comments for ratio & proportions








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These heart of algebra questions will help you prepare to take the math portion of the SAT
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