Apostal clerk sold some 15 cent stamps and some 25 cent stamps. altogether 10 stamps were sold for a total cost of 1.70$. how many of each type of stamp were sold?

Step-by-step explanation:

Let the number of  15 cent stamps be represented by X and

let the number of  25 cent stamps be represented by Y.

The equations would be as follows;

X+Y = 10

0.15X + 0.25Y = 1.70

To get X in terms of Y, use the first equation ; X = 10-Y

Next, replace X in the second equation by 10 -Y

0.15(10-Y) + 0.25Y = 1.70

1.5 -0.15Y +0.25Y = 1.70

Subtract 1.5 from both sides of the equation and sum up the Ys;

0.1Y = 1.70-1.5

0.1Y = 0.2

Divide both sides by 0.1;

Y = 0.2 / 0.1

Y = 2

Replace Y by 2 in any of the first to equations, I'll use X+Y=10;

X+2 =10

X= 8

Therefore, the 15 cents stamps are 8 and 0.25cents stamps are 2

b

step-by-step explanation:

ez

answer: a. 13/44

step-by-step explanation: judging by the information given to us, we are looking for experimental probability. we can see that 13 males have chosen chocolate ice cream. there are 44 ice creams in total (remember that the total is always the denominator). so our answer is 13/44.