A) Tim is tiling a wall and needs to buy at least 100 tiles. The tiles are sold in large packs and small packs.
Large pack 40 tiles £17
Small pack 26 tiles £12
Special offer
25% reduction when you buy 3 or more large packs
Work out the cheapest cost to buy the packs of tiles he needs.
Your final line must say, Cheapest cost =
(3)
b) If a floor tile is a square with side 40 cm, how many tiles would be
needed to tile a rectangular floor with length 640 cm and width 200 cm? (1)
Tiles needed
Total marks: 4

the answer is the third / last answer

step-by-step explanation:

hello!

to begin with, we're given that on earth, a rock weighs 20 pounds, and while on jupiter, that same rock weighs 42 pounds. now, we're trying to find the weight of a rock that weighs 10.5 pounds on earth, on jupiter.

to solve this, first, set up a proportion, cross-multiply, and solve it algebraically.

setting up the proportion is the hardest and the most confusing part of the problem, but it's simple.

if on earth, the rock weighs 20 lbs, and on jupiter it weighs 42 lbs, our first part of our proportion is 20/42 lbs. the second part has to be equal to each other. this means that 10.5 has to be on the numerator of the fraction, and x, the value we're trying to find, has to be on the denominator. remember that the rock weighs 10.5 lbs on earth, and we're trying to find the weight of it on jupiter (which is x).

20/42 = 10.5/x

next, you would cross-multiply.

20x = 42(10.5)

20x = 441

now, solve it algebraically by using division.

x = 22.05 lbs

this can be rounded to 22.1 lbs.

therefore, the weight of the rock on jupiter is 22.1 lbs, the fourth choice.