From the word problem, let it be:
• m: March rain
,
• a: April rain
Also, we know that:
• m = 0.94 in
,
• We can write the phrase 'It rained 0.05 inches less in april than in march' as the following equation:

Now, we replace the value of m on the above equation, and we solve it for a:

Therefore, in April, it rained 0.89 inches.