The mass of rust is made up of 7 grams of iron for every 10 grams of rust. How many?

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grams of iron are there in 25 grams of rust?

2006-10-09 02:26:49 · 5 answers · asked by osurules 1 in Science & Mathematics ➔ Mathematics

7g iron / 10 g rust = X g iron / 25 g rust

Cross multiply:

7*25 = 10X

175 = 10X

17.5 = X

So there are 17.5 g of iron in 25 g of rust.

2006-10-09 02:29:16 · answer #1 · answered by James L 5 · 0⤊ 0⤋

Rust Is Made Up Of

2017-01-12 18:37:59 · answer #2 · answered by hummons 4 · 0⤊ 0⤋

restating the problem...
7g iron for each 10g rust.
how much iron for 25g rust

7 / 10 = x / 25
7 = 10x/25
7 * 25 = 10x
175 = 10x
x = 17.5

2006-10-09 02:31:06 · answer #3 · answered by DanE 7 · 0⤊ 0⤋

7/10 = x/25
x = 25*7/10
x = 25*.7
x = 17.5

2006-10-09 02:31:23 · answer #4 · answered by FrogDog 4 · 0⤊ 0⤋

17.5

2006-10-09 02:30:59 · answer #5 · answered by tsunamijon 4 · 0⤊ 0⤋