In a school, 10% of number of girls is equal to $\frac{1}{20}$ th of number of boys. Ratio between the number of boys to umber of girls is

In a school, 10% of number of girls is equal to $\frac{1}{20}$ th of number of boys. Ratio between the number of boys to umber of girls is
1). 1:2
2). 2:1
3). 1:4
4). 4:1

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1. Rs 3200 is divided among A, B and C in the ratio of 3 : 5 : 8 respectively. What is the difference (in Rs) between the share of B and C?

2.  The duplicate ratio of 3:4 is?

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