If 3a+4b = 10 and 5a+3b=30, what is the average (arithmetic mean) of a and b ?

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A and B together have Tk. 1210. If 4/15 of A's amount is equal to 2/5 of B's amount, what is amount B has ?

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A room of size 5m X 3m and height 3m requires walls and ceiling painting. What is the area to be painted?

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An amount of money becomes Tk. 1,860 at an interest rate of 8% in 3 years. How many years the money would take to become Tk. 2040 at the same interest rate?

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What percent of 200 is 0.001% of 22×53?

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If a car can drive 25 km on two litters of octane, how many litters will be needed for a trip of 150 km?

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