The statement of this problem is not correct.
Let, the number of apple = x
The number pears = 21 -x
Total price of apple = Tk. 10x
And total price of pears = Tk. (21 — x)15
=>10x+15(21—x)=380
=>10x+315-15x=380
=>—5x=380—315
=>—5x=65
x = — 13, the negative number is not possible.(problem is not correct.)
56, 48 Mph
Suppose, Average speed of one car = x mile per hour
Speed of other car = (x + 8)mph
So, 2{x + (x + 8)} = 208
=> 2(2x + 8) = 208
=>4x + 16 = 208
x = 48 mph
Speed of other car =x + 8 = 48 + 8 = 56 mph.
45.56%
Let, 2 years ago Selim’s saIaiy was = Tk. 200
2 years ago Kashem’s salary was = Tk. 200 x %= 100
At first year, at the rate of 10%, Selim’s salary was increased to = 200 + 10% of 200 = Tk. 220
and at the same rate, at second year his salary was = 220 + 10% of 220
= 220 + 22 = Tk. 242.
For Kashem, at first year and 5% rate, the salary increased to = 100 + 5% of 100 = Tk. 105
and at second year = 105 + 5% of 105 = Tk. 110.25
(Kashem s salary / Selim s salary) x 100 =$\frac{110.25×100}{242}$= 45.56%
1400 Gallon
Let, Tank Y contain = Y gallon,
X contain = Y + 600 gallon
According to the question,
Y—100+(Y+600)—-100=3Y
Y = 400
Tank X contain = (400 + 600) gallon = 1000 gallon
Total number of gallon = (1000 + 400) gallon = 1400 gallon
Tk. 3,00,000.
Let, cost of the car = Tk. x
Import duty = 50% of x = 0.50x
Cost + import duty = 1.5x Tk.
The supplementary tax = 30% of 1.5x = 0.30 x 1.5x = Tk. 0.45x
Import duty + Supplementary tax = Tk. 0.5x + Tk. 0.45x = Tk. 0.95x
So, according to question
0.95x= 2,85,000
x = 3,00,000
Cost of the car = Tk. 3,00,000.
