exam Maths Puzzle Numerical Ability

0.05x - 0.3 = 1.8

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exam Other Question

If there are 6 * 10^9 people on the Earth and there is enough freshwater
to provide each person with 8.79 * 10^5 L, how much freshwater is on the
Earth? TRWANSLATE TO AN ALGEBRAIC EXPRESSION:TWENTY LESS THAN SOME NUMBER.