For the following questions answer them individually
The HCF of two numbers 24 and their LCM is 216. If one of the number is 72, then the other number is
In a co-educational secondary school 65% of the students are boys. If there are 224 girls in the school, find the number of boys in the school ?
A mixture of 30 litres of spirit and water contains 20% of water in it. How much water must be added to it, to make the water 25% in the new mixture ?
The ages of x and y are in the ratio 3:1. Fifteen years hence, the ratio will be 2:1. The present ages (in years) are:
Gold is 19 times as heavy as water and copper is 9 times as heavy as water. In what ratio should these be mixed to get an alloy 15 times as heavy as water ?
The average of Rajeev’s marks in 7 subjects is 75. His average in six subjects excluding science is 72. How many marks did he get in science ?
If a sum of money doubles itself in 8 years at simple interest, the rate percent per annum is
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