Isandro and Yvette each have a calculator. Yvette starts at 100 and subtracts 7 each time. Isandro on the other hand, starts at zero and adds 3 each time. If they press the keys at the same time, will their displays ever show the same number? if so, what is the number?
1 answer:
Yvette = 100-7x Isandro = 0+3x 0+3x = 100 - 7x 0+3x+7x = 100 - 7x +7x 10x = 100 x = 10 So on the 10th time they have the same number, which is 30.
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