how many fewer grames of caffeine is she consuming each week?

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how many fewer grames of caffeine is she consuming each week?enter image description here

I try with the following

2*97*7 + 5 * 6 *7 = 1358 +210 = 1568 mg convert to gram = 1.568

but not correct , please help how calculate ??

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You are looking for the difference, not the sum.