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If the 4-digit number 48ab is divisible by 2, 5 and 7, then the value of $$(10a - b)$$ is
Being divisible by both 2 and 5 means the number is divisible by 10, so $$b = 0$$. The number $$48a0 = 4800 + 10a$$ must be divisible by 7; since $$4800 = 7 \times 685 + 5$$, trying digits shows $$a = 3$$ works because $$4830 = 7 \times 690$$. Hence $$10a - b = 30 - 0 = 30$$.
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