a photo sized 15cm by 10.5cm was enlarged so that its area is twice as big as it was before. what are the dimensions of the new photo?
You want to multiply both sides (length and width) by the same number and you want this product to be 2*157.5cm^2I only managed to work out the area of the original one. 15*10.5=157.5cm^2. Nothing else. Can you help...please?
Since you posted this to "Arithmetic" rather than to any of the geometry or algebra categories, I'll assume that you don't know about variables or equations yet. So what method have they give you to use for this sort of exercise?a photo sized 15cm by 10.5cm was enlarged so that its area is twice as big as it was before. what are the dimensions of the new photo?