Question
660 ml of a mixture contains milk and water in the ratio
2:3. If `x` ml of milk and `(x + 80)` ml of water are added, the final ratio becomes 7:9. Find the value of `x`.Solution
Milk = (2/5) × 660 = 264 ml
Water = (3/5) × 660 = 396 ml
(264 + x)/(396 + x + 80) = 7/9
9(264 + x) = 7(476 + x)
2376 + 9x = 3332 + 7x
2x = 956
⇒ x = 478
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