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Start learning 50% faster. Sign in nowWe are given 63a9b is divisible by 72, so it must be divisible by 8 and 9. Divisible by 8 → last 3 digits (a9b) must be divisible by 8 Try values → a = 7, b = 2 gives 792, and 792 ÷ 8 = 99 ✅ Divisible by 9 → sum of digits: 6 + 3 + 7 + 9 + 2 = 27, which is divisible by 9 ✅ So the number is 63792 → a = 7, b = 2 → a + 2b = 7 + 4 = 11
Among 132 examinees of a certain school, the ratio of successful to unsuccessful students is 9 : 2, Had 4 more students passed, then the ratio of succes...
Two vessels, A and B, contain mixtures of milk and water in the ratios 11:9 and 13:37, respectively. The quantities of mixtures in A and B are in the ra...
The incomes of A and B are in the ratio of 3:2 and their expenditures are Rs. 14,000 and Rs. 10,000 respectively. If A saves Rs. 7000, then B's savings ...
In what ratio should coffee powder costing Rs 2500/kg be mixed with coffee powder costing Rs 1500/kg so that the cost of the mixture is Rs 2250/kg?
The ratio of the number of apples and oranges in a fruit market is 5:4, respectively. If 40% of apples are red and 50% of oranges are sour, find the rat...
A bag contains 10-paisa, 20-paisa and 50-paisa coins in the ratio of 9:7:5, respectively. If the total amount in the bag is Rs. 48, then find 40% of the...
A student's scores in four subjects are in the ratio 3:4:5:6. The student achieved an overall average of 72% on the exam. If the maximum possible score ...
