In a certain chemical, the ratio of zinc to copper is 3 to 16. a jar of the chemical contains 736 grams of copper. how many grams of zinc does it contain?

The jar has 138 grams of zinc.

Solution:

Given that , In a certain chemical reaction, the ratio of zinc to copper is 3 to 16.  

A jar of the chemical contains 736 grams of copper.  

We have to find how many grams of zinc does it contain

Let "n" be the grams of zinc needed for 736 grams of copper  

Now, we know that,  

16 grams of copper ⇒ 3 grams of zinc

Then, 736 grams of copper ⇒ n grams of zinc

So, by criss cross multiplication,

16n = 3 x 736

16n = 2208

n = 138

Hence, the jar has 138 grams of zinc.

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)

it would take 7/10 of an hour too fill the pool.

step-by-step explanation: