11. In a race of 400m, A gave B a head start of 20m at the start of the race. B took 48 seconds to complete the race. What was the speed of A if B defeated A by a margin of 2 seconds...
21. In a class, the ratio of number of girls to boys is 1:2. If the average weight of boys is 55 kg and the average weight of girls and boys is 50 kg then find the average weight of...
11. In two alloys A and B the ratio of zic to tin is 5:2 and 3:4 respectively. 7kg of alloy A and 21kg of the alloy B are mixed together to form a new alloy. What will be the ratio of zinc and tin in the new alloy...
1. 15 litres of a mixture of milk and water in the ratio 2:1, the amount of milk added to the mixture so as to have milk and water in the ratio 5:2 ?...
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