The half-life on an isotope is the amount of time required for 50 % of a sample of the isotope to under-go radioactive decay. The half-life of the carbon-14 isotope is 5,730 years. How many years must pass until a sample that starts out with 16,000 carbon-14 isotopes decays into a sample with only 500 carbon-14 isotopes?

1.The ratio of the number of freshmen to sophomores to juniors to seniors on a College football team is 4:7:6:8. What percent of the team ar sophomores?

Bangladesh University of Professionals (BUP) · 2016

2.What is the cost in taka to put tiles in a room of x yards long and y yards wide, if the tile costs 10 taka per square foot?

Bangladesh University of Professionals (BUP) · 2016

3.If joe is now x years old and Marie is 6 years older than joe, which of the following gives Marie's age 8 years ago?

Bangladesh University of Professionals (BUP) · 2016

4.How many meters of fencing are needed to enclose a circular flower bed the radius of which is 7 meters?

Bangladesh University of Professionals (BUP) · 2016

5.if the average of p and q is 7 and r=13, what is the average of p,q and r ?

Bangladesh University of Professionals (BUP) · 2016

6.8% of 0.06= ?

Bangladesh University of Professionals (BUP) · 2016

7.How many prime numbers are there between 45 and 72?

Bangladesh University of Professionals (BUP) · 2016

8.if x = -1 then ( x$^4$ +x$^3$ +x$^2$ ) = ?

Bangladesh University of Professionals (BUP) · 2016

9.A trader incurs a loss of 10% from selling an item. If the selling price was Tk. 200 more, he would have made a profit of 15%. What was the cost of the item?

Bangladesh University of Professionals (BUP) · 2016

10.If the price of an item increases from Tk. 5 to Tk. 8 , the old price is what % of the new price?

Bangladesh University of Professionals (BUP) · 2016

11.Three years back, a father was 24 years older than his son. at present the father is 5 $\times as old as the$ son. How old will the son be three years from now?

Bangladesh University of Professionals (BUP) · 2016

12.In a certain group, 12 of the children average are age 10 and eight are age 15 . What is the average of the ages of all the children in the group?

Bangladesh University of Professionals (BUP) · 2016