Inflow from Tap Y: +4 L/min. Inflow from Tank A: +3 L/min. Total gain for Tank B = 4 + 3 = +7 L/min .

Here is a quick reference for some other commonly asked 2017 PSLE Math questions and their answers:

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The total number of circles in Figure $n$ is the sum of numbers from 1 to $n$. Formula: $\textTotal = \fracn(n+1)2$

$5.9 \div 4 = 1.475 \text kg$

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